| <!DOCTYPE html> |
| <html lang="en-US"> |
| <head> |
| <meta charset="utf-8"> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <title> </title> |
| <meta name="generator" content="VuePress 1.8.2"> |
| <link rel="icon" href="/favicon.ico"> |
| <meta name="description" content=" "> |
| <meta name="Description" content="Apache IoTDB: Time Series Database for IoT"> |
| <meta name="Keywords" content="TSDB, time series, time series database, IoTDB, IoT database, IoT data management,时序数据库, 时间序列管理, IoTDB, 物联网数据库, 实时数据库, 物联网数据管理, 物联网数据"> |
| <meta name="baidu-site-verification" content="wfKETzB3OT"> |
| <meta name="google-site-verification" content="mZWAoRY0yj_HAr-s47zHCGHzx5Ju-RVm5wDbPnwQYFo"> |
| |
| <link rel="preload" href="/assets/css/0.styles.ccadf850.css" as="style"><link rel="preload" href="/assets/js/app.c078fe6d.js" as="script"><link rel="preload" href="/assets/js/3.5626571b.js" as="script"><link rel="preload" href="/assets/js/254.03023b0c.js" as="script"><link rel="prefetch" href="/assets/js/10.77e7d27b.js"><link rel="prefetch" href="/assets/js/100.ed95c785.js"><link rel="prefetch" href="/assets/js/101.a72c7dae.js"><link rel="prefetch" href="/assets/js/102.8c0e7138.js"><link rel="prefetch" href="/assets/js/103.5753f058.js"><link rel="prefetch" href="/assets/js/104.194a7259.js"><link rel="prefetch" href="/assets/js/105.09df4ac9.js"><link rel="prefetch" href="/assets/js/106.094ff7f6.js"><link rel="prefetch" href="/assets/js/107.4b6fc970.js"><link rel="prefetch" href="/assets/js/108.b66c9a8f.js"><link rel="prefetch" href="/assets/js/109.57f04174.js"><link rel="prefetch" href="/assets/js/11.242ea813.js"><link rel="prefetch" href="/assets/js/110.29e2499d.js"><link rel="prefetch" href="/assets/js/111.b721374e.js"><link rel="prefetch" href="/assets/js/112.44732d74.js"><link rel="prefetch" href="/assets/js/113.18a4c509.js"><link rel="prefetch" href="/assets/js/114.0d8f2607.js"><link rel="prefetch" href="/assets/js/115.fbfba1eb.js"><link rel="prefetch" href="/assets/js/116.b394d6f1.js"><link rel="prefetch" href="/assets/js/117.31310d35.js"><link rel="prefetch" href="/assets/js/118.9449e49f.js"><link rel="prefetch" href="/assets/js/119.07c43a65.js"><link rel="prefetch" href="/assets/js/12.27121867.js"><link rel="prefetch" href="/assets/js/120.bfa7845b.js"><link rel="prefetch" href="/assets/js/121.bc24c094.js"><link rel="prefetch" href="/assets/js/122.33f80e4f.js"><link rel="prefetch" href="/assets/js/123.41140603.js"><link rel="prefetch" href="/assets/js/124.e5fcecb4.js"><link rel="prefetch" href="/assets/js/125.5d156960.js"><link rel="prefetch" href="/assets/js/126.21af8edc.js"><link rel="prefetch" href="/assets/js/127.94f1a74a.js"><link rel="prefetch" href="/assets/js/128.1443fd28.js"><link rel="prefetch" href="/assets/js/129.9c9730d2.js"><link rel="prefetch" href="/assets/js/13.3883cb5c.js"><link rel="prefetch" href="/assets/js/130.3ebaf1e9.js"><link rel="prefetch" href="/assets/js/131.2d9c5787.js"><link rel="prefetch" href="/assets/js/132.f9dd7e91.js"><link rel="prefetch" href="/assets/js/133.ad89487a.js"><link rel="prefetch" href="/assets/js/134.d1975511.js"><link rel="prefetch" href="/assets/js/135.5023bae6.js"><link rel="prefetch" href="/assets/js/136.a836f92f.js"><link rel="prefetch" href="/assets/js/137.031b1c91.js"><link rel="prefetch" href="/assets/js/138.808bb4c5.js"><link rel="prefetch" href="/assets/js/139.9eb29936.js"><link rel="prefetch" href="/assets/js/14.66eebc6d.js"><link rel="prefetch" href="/assets/js/140.790e788a.js"><link rel="prefetch" href="/assets/js/141.861cd277.js"><link rel="prefetch" href="/assets/js/142.80570522.js"><link rel="prefetch" href="/assets/js/143.9299561a.js"><link rel="prefetch" href="/assets/js/144.880c0628.js"><link rel="prefetch" href="/assets/js/145.0d4332a7.js"><link rel="prefetch" href="/assets/js/146.e48d5d3f.js"><link rel="prefetch" href="/assets/js/147.969b5194.js"><link rel="prefetch" href="/assets/js/148.a56545f4.js"><link rel="prefetch" href="/assets/js/149.b6a0c0c4.js"><link rel="prefetch" href="/assets/js/15.0953eb10.js"><link rel="prefetch" href="/assets/js/150.0782606d.js"><link rel="prefetch" href="/assets/js/151.5683c2c2.js"><link rel="prefetch" href="/assets/js/152.b9e6108f.js"><link rel="prefetch" href="/assets/js/153.5f4e036b.js"><link rel="prefetch" href="/assets/js/154.1586319b.js"><link rel="prefetch" href="/assets/js/155.d5148213.js"><link rel="prefetch" href="/assets/js/156.0bf09079.js"><link rel="prefetch" href="/assets/js/157.de989c5f.js"><link rel="prefetch" href="/assets/js/158.2d4ad862.js"><link rel="prefetch" href="/assets/js/159.969149d7.js"><link rel="prefetch" href="/assets/js/16.be3a02b8.js"><link rel="prefetch" href="/assets/js/160.78670d5a.js"><link rel="prefetch" href="/assets/js/161.1cd134b5.js"><link rel="prefetch" href="/assets/js/162.ff855c9e.js"><link rel="prefetch" href="/assets/js/163.be160611.js"><link rel="prefetch" href="/assets/js/164.05d19e54.js"><link rel="prefetch" href="/assets/js/165.a50ca901.js"><link rel="prefetch" href="/assets/js/166.7e46ca06.js"><link rel="prefetch" href="/assets/js/167.f3bc9b1a.js"><link rel="prefetch" href="/assets/js/168.5dbef9ef.js"><link rel="prefetch" href="/assets/js/169.62ebff32.js"><link rel="prefetch" href="/assets/js/17.9b09b22d.js"><link rel="prefetch" href="/assets/js/170.d07644e9.js"><link rel="prefetch" href="/assets/js/171.c66629ae.js"><link rel="prefetch" href="/assets/js/172.198937cc.js"><link rel="prefetch" href="/assets/js/173.6f1d25bb.js"><link rel="prefetch" href="/assets/js/174.4301124f.js"><link rel="prefetch" href="/assets/js/175.52d930f3.js"><link rel="prefetch" href="/assets/js/176.0a709f70.js"><link rel="prefetch" href="/assets/js/177.677a710c.js"><link rel="prefetch" href="/assets/js/178.ca5b82c4.js"><link rel="prefetch" href="/assets/js/179.3bf817aa.js"><link rel="prefetch" href="/assets/js/18.122d5826.js"><link rel="prefetch" href="/assets/js/180.d6609806.js"><link rel="prefetch" href="/assets/js/181.f1fddd4e.js"><link rel="prefetch" href="/assets/js/182.b157bcef.js"><link rel="prefetch" href="/assets/js/183.fc45ef1f.js"><link rel="prefetch" href="/assets/js/184.27c76bd8.js"><link rel="prefetch" href="/assets/js/185.60e0c4f0.js"><link rel="prefetch" href="/assets/js/186.5e5cc224.js"><link rel="prefetch" href="/assets/js/187.8b1b0fef.js"><link rel="prefetch" href="/assets/js/188.b1c25ca7.js"><link rel="prefetch" href="/assets/js/189.a1554dd6.js"><link rel="prefetch" href="/assets/js/19.9b7b8a2e.js"><link rel="prefetch" href="/assets/js/190.d570a033.js"><link rel="prefetch" href="/assets/js/191.65b131c8.js"><link rel="prefetch" href="/assets/js/192.b8e6cbed.js"><link rel="prefetch" href="/assets/js/193.5b4a249f.js"><link rel="prefetch" href="/assets/js/194.0b990bce.js"><link rel="prefetch" href="/assets/js/195.36a17d0f.js"><link rel="prefetch" href="/assets/js/196.7f934e27.js"><link rel="prefetch" href="/assets/js/197.d79fb1cc.js"><link rel="prefetch" href="/assets/js/198.4f793066.js"><link rel="prefetch" href="/assets/js/199.c3a9c262.js"><link rel="prefetch" href="/assets/js/20.cf088c3b.js"><link rel="prefetch" href="/assets/js/200.9b3f4e62.js"><link rel="prefetch" href="/assets/js/201.69d0d24c.js"><link rel="prefetch" href="/assets/js/202.c9d492d5.js"><link rel="prefetch" href="/assets/js/203.b5809cc8.js"><link rel="prefetch" href="/assets/js/204.f75323db.js"><link rel="prefetch" href="/assets/js/205.43f0a3f2.js"><link rel="prefetch" href="/assets/js/206.ec3a5703.js"><link rel="prefetch" href="/assets/js/207.6a13e9ee.js"><link rel="prefetch" href="/assets/js/208.bcb17d87.js"><link rel="prefetch" href="/assets/js/209.451e2e0a.js"><link rel="prefetch" href="/assets/js/21.74ba2b3e.js"><link rel="prefetch" href="/assets/js/210.270f1973.js"><link rel="prefetch" href="/assets/js/211.e0f5c71f.js"><link rel="prefetch" href="/assets/js/212.3b65856b.js"><link rel="prefetch" href="/assets/js/213.593f93f2.js"><link rel="prefetch" href="/assets/js/214.30eaa159.js"><link rel="prefetch" href="/assets/js/215.55b67e29.js"><link rel="prefetch" href="/assets/js/216.a084f9ef.js"><link rel="prefetch" href="/assets/js/217.bd6d9c4a.js"><link rel="prefetch" href="/assets/js/218.afb01d10.js"><link rel="prefetch" href="/assets/js/219.50a9778c.js"><link rel="prefetch" href="/assets/js/22.f9d73f8a.js"><link rel="prefetch" href="/assets/js/220.6ecbd946.js"><link rel="prefetch" href="/assets/js/221.2f844304.js"><link rel="prefetch" href="/assets/js/222.a9c9ecd1.js"><link rel="prefetch" href="/assets/js/223.517813e9.js"><link rel="prefetch" href="/assets/js/224.cf6ca794.js"><link rel="prefetch" href="/assets/js/225.f88e7104.js"><link rel="prefetch" href="/assets/js/226.0135c33a.js"><link rel="prefetch" href="/assets/js/227.0aded7a3.js"><link rel="prefetch" href="/assets/js/228.ac120f0d.js"><link rel="prefetch" href="/assets/js/229.d5c30f16.js"><link rel="prefetch" href="/assets/js/23.91ba0b88.js"><link rel="prefetch" href="/assets/js/230.d14a3b0e.js"><link rel="prefetch" href="/assets/js/231.b0216fac.js"><link rel="prefetch" href="/assets/js/232.4f6b6373.js"><link rel="prefetch" href="/assets/js/233.0f3d666a.js"><link rel="prefetch" href="/assets/js/234.fb6110df.js"><link rel="prefetch" href="/assets/js/235.bb1d80a7.js"><link rel="prefetch" href="/assets/js/236.7e36d034.js"><link rel="prefetch" href="/assets/js/237.c026991c.js"><link rel="prefetch" href="/assets/js/238.01a1d668.js"><link rel="prefetch" href="/assets/js/239.3fb83483.js"><link rel="prefetch" href="/assets/js/24.de37758e.js"><link rel="prefetch" href="/assets/js/240.b09d943f.js"><link rel="prefetch" href="/assets/js/241.abcc8b65.js"><link rel="prefetch" href="/assets/js/242.67867070.js"><link rel="prefetch" href="/assets/js/243.18ef3398.js"><link rel="prefetch" href="/assets/js/244.afe8e0b9.js"><link rel="prefetch" href="/assets/js/245.53053187.js"><link rel="prefetch" href="/assets/js/246.20d4e857.js"><link rel="prefetch" href="/assets/js/247.78cf01d5.js"><link rel="prefetch" href="/assets/js/248.d7083c9e.js"><link rel="prefetch" href="/assets/js/249.f3fbd856.js"><link rel="prefetch" href="/assets/js/25.77e4633a.js"><link rel="prefetch" href="/assets/js/250.8db63391.js"><link rel="prefetch" href="/assets/js/251.2099ebdb.js"><link rel="prefetch" href="/assets/js/252.811a7e8c.js"><link rel="prefetch" href="/assets/js/253.c5296748.js"><link rel="prefetch" href="/assets/js/255.e5bf4735.js"><link rel="prefetch" href="/assets/js/256.485d661c.js"><link rel="prefetch" href="/assets/js/257.70333061.js"><link rel="prefetch" href="/assets/js/258.cb83463b.js"><link rel="prefetch" href="/assets/js/259.a02febe0.js"><link rel="prefetch" href="/assets/js/26.0057d37b.js"><link rel="prefetch" href="/assets/js/260.d0cdc5bb.js"><link rel="prefetch" href="/assets/js/261.3c8b8c14.js"><link rel="prefetch" href="/assets/js/262.ea831304.js"><link rel="prefetch" href="/assets/js/263.8af36533.js"><link rel="prefetch" href="/assets/js/264.cb79ef91.js"><link rel="prefetch" href="/assets/js/265.9a2f2a85.js"><link rel="prefetch" href="/assets/js/266.ca225af9.js"><link rel="prefetch" href="/assets/js/267.c1696137.js"><link rel="prefetch" href="/assets/js/268.260a8ab7.js"><link rel="prefetch" href="/assets/js/269.33629f13.js"><link rel="prefetch" href="/assets/js/27.9e25f953.js"><link rel="prefetch" href="/assets/js/270.e5fa0340.js"><link rel="prefetch" href="/assets/js/271.8f9420fc.js"><link rel="prefetch" href="/assets/js/272.c03fdadb.js"><link rel="prefetch" href="/assets/js/273.df3db881.js"><link rel="prefetch" href="/assets/js/274.4f59983e.js"><link rel="prefetch" href="/assets/js/275.785fd825.js"><link rel="prefetch" href="/assets/js/276.4658b553.js"><link rel="prefetch" href="/assets/js/277.234e8c60.js"><link rel="prefetch" href="/assets/js/278.8b7117be.js"><link rel="prefetch" href="/assets/js/279.2caa2bbe.js"><link rel="prefetch" href="/assets/js/28.0a801078.js"><link rel="prefetch" href="/assets/js/280.70f3e9dc.js"><link rel="prefetch" href="/assets/js/281.7d815a5c.js"><link rel="prefetch" href="/assets/js/282.9e1cd96b.js"><link rel="prefetch" href="/assets/js/283.5704a51c.js"><link rel="prefetch" href="/assets/js/284.ac2bf191.js"><link rel="prefetch" href="/assets/js/285.6e89e254.js"><link rel="prefetch" href="/assets/js/286.c89d7656.js"><link rel="prefetch" href="/assets/js/287.7446e94d.js"><link rel="prefetch" href="/assets/js/288.479655dd.js"><link rel="prefetch" href="/assets/js/289.659caaed.js"><link rel="prefetch" href="/assets/js/29.015a0cef.js"><link rel="prefetch" href="/assets/js/290.0493ffb9.js"><link rel="prefetch" href="/assets/js/291.81e22a75.js"><link rel="prefetch" href="/assets/js/292.2ee40b66.js"><link rel="prefetch" href="/assets/js/293.183d5889.js"><link rel="prefetch" href="/assets/js/294.49874dd4.js"><link rel="prefetch" href="/assets/js/295.d45ea8c1.js"><link rel="prefetch" href="/assets/js/296.d386f7e9.js"><link rel="prefetch" href="/assets/js/297.2697f10a.js"><link rel="prefetch" href="/assets/js/298.0790ad48.js"><link rel="prefetch" href="/assets/js/299.732aafc4.js"><link rel="prefetch" href="/assets/js/30.03cf4852.js"><link rel="prefetch" href="/assets/js/300.8147e316.js"><link rel="prefetch" href="/assets/js/301.7986fcfa.js"><link rel="prefetch" href="/assets/js/302.fbea453a.js"><link rel="prefetch" href="/assets/js/303.90b0c08b.js"><link rel="prefetch" href="/assets/js/304.ae9e278b.js"><link rel="prefetch" href="/assets/js/305.3a44047c.js"><link rel="prefetch" href="/assets/js/306.d1ed6747.js"><link rel="prefetch" href="/assets/js/307.19b6834f.js"><link rel="prefetch" href="/assets/js/308.75fc5433.js"><link rel="prefetch" href="/assets/js/309.912d7531.js"><link rel="prefetch" href="/assets/js/31.9af92350.js"><link rel="prefetch" href="/assets/js/310.2bb387a8.js"><link rel="prefetch" href="/assets/js/311.da17b546.js"><link rel="prefetch" href="/assets/js/312.033eed97.js"><link rel="prefetch" href="/assets/js/313.fc0e389d.js"><link rel="prefetch" href="/assets/js/314.7f57565d.js"><link rel="prefetch" href="/assets/js/315.a707c807.js"><link rel="prefetch" href="/assets/js/316.920bb2f9.js"><link rel="prefetch" href="/assets/js/317.0719853c.js"><link rel="prefetch" href="/assets/js/318.41dcab2e.js"><link rel="prefetch" href="/assets/js/319.3734e844.js"><link rel="prefetch" href="/assets/js/32.e5e702b0.js"><link rel="prefetch" href="/assets/js/320.0bdbffa7.js"><link rel="prefetch" href="/assets/js/321.a9656a07.js"><link rel="prefetch" href="/assets/js/322.5e9450f4.js"><link rel="prefetch" href="/assets/js/323.674bf9b3.js"><link rel="prefetch" href="/assets/js/324.aa72ae49.js"><link rel="prefetch" href="/assets/js/325.f77fd1b4.js"><link rel="prefetch" href="/assets/js/326.4ecf6add.js"><link rel="prefetch" href="/assets/js/327.09a29a3d.js"><link rel="prefetch" href="/assets/js/328.40c1d259.js"><link rel="prefetch" href="/assets/js/329.e776998e.js"><link rel="prefetch" href="/assets/js/33.d0eafbb9.js"><link rel="prefetch" href="/assets/js/330.84027fd8.js"><link rel="prefetch" href="/assets/js/331.f068bd55.js"><link rel="prefetch" href="/assets/js/332.0e5f0f38.js"><link rel="prefetch" href="/assets/js/333.1c7124ce.js"><link rel="prefetch" href="/assets/js/334.813ded8e.js"><link rel="prefetch" href="/assets/js/335.8bed5efb.js"><link rel="prefetch" href="/assets/js/336.fc89e644.js"><link rel="prefetch" href="/assets/js/337.91b7a655.js"><link rel="prefetch" href="/assets/js/338.cfff9d17.js"><link rel="prefetch" href="/assets/js/339.17770dae.js"><link rel="prefetch" href="/assets/js/34.85849ed4.js"><link rel="prefetch" href="/assets/js/340.5e3f5af3.js"><link rel="prefetch" href="/assets/js/341.eef6be19.js"><link rel="prefetch" href="/assets/js/342.d5050fa2.js"><link rel="prefetch" href="/assets/js/343.b5963f08.js"><link rel="prefetch" href="/assets/js/344.b246b989.js"><link rel="prefetch" href="/assets/js/345.cb808b6a.js"><link rel="prefetch" href="/assets/js/346.d1af1e00.js"><link rel="prefetch" href="/assets/js/347.bcf05eb4.js"><link rel="prefetch" href="/assets/js/348.ec1dc1ed.js"><link rel="prefetch" href="/assets/js/349.cd1e39fa.js"><link rel="prefetch" href="/assets/js/35.5612ab6a.js"><link rel="prefetch" href="/assets/js/350.9f16f781.js"><link rel="prefetch" href="/assets/js/351.b563631f.js"><link rel="prefetch" href="/assets/js/352.007f942f.js"><link rel="prefetch" href="/assets/js/353.bbf4e9c2.js"><link rel="prefetch" href="/assets/js/354.4311bd66.js"><link rel="prefetch" href="/assets/js/355.108499f2.js"><link rel="prefetch" href="/assets/js/356.a81636e7.js"><link rel="prefetch" href="/assets/js/357.35ca1b7b.js"><link rel="prefetch" href="/assets/js/358.e7025787.js"><link rel="prefetch" href="/assets/js/359.91cac463.js"><link rel="prefetch" href="/assets/js/36.5a401e9f.js"><link rel="prefetch" href="/assets/js/360.f65ac7e5.js"><link rel="prefetch" href="/assets/js/361.58929dff.js"><link rel="prefetch" href="/assets/js/362.d65c727e.js"><link rel="prefetch" href="/assets/js/363.3b5d8085.js"><link rel="prefetch" href="/assets/js/364.d17737d3.js"><link rel="prefetch" href="/assets/js/365.e679ba47.js"><link rel="prefetch" href="/assets/js/366.5ceace94.js"><link rel="prefetch" href="/assets/js/367.140df2b7.js"><link rel="prefetch" href="/assets/js/368.e46272ab.js"><link rel="prefetch" href="/assets/js/369.39547fbd.js"><link rel="prefetch" href="/assets/js/37.15871763.js"><link rel="prefetch" href="/assets/js/370.ca1215ed.js"><link rel="prefetch" href="/assets/js/371.e25a2848.js"><link rel="prefetch" href="/assets/js/372.205e1d0f.js"><link rel="prefetch" href="/assets/js/373.8ba7c5ac.js"><link rel="prefetch" href="/assets/js/374.bf50b733.js"><link rel="prefetch" href="/assets/js/375.1c735a6d.js"><link rel="prefetch" href="/assets/js/376.9a087a53.js"><link rel="prefetch" href="/assets/js/377.edec1505.js"><link rel="prefetch" href="/assets/js/378.bfde20e4.js"><link rel="prefetch" href="/assets/js/379.f33acc18.js"><link rel="prefetch" href="/assets/js/38.b02b6af6.js"><link rel="prefetch" href="/assets/js/380.9fe6b811.js"><link rel="prefetch" href="/assets/js/381.286eb8c1.js"><link rel="prefetch" href="/assets/js/382.69e55228.js"><link rel="prefetch" href="/assets/js/383.d8aef30b.js"><link rel="prefetch" href="/assets/js/384.85cd434d.js"><link rel="prefetch" href="/assets/js/385.1477251c.js"><link rel="prefetch" href="/assets/js/386.b037901f.js"><link rel="prefetch" href="/assets/js/387.3b662ff8.js"><link rel="prefetch" href="/assets/js/388.9a6dd37c.js"><link rel="prefetch" href="/assets/js/389.61634031.js"><link rel="prefetch" href="/assets/js/39.b5f4c79a.js"><link rel="prefetch" href="/assets/js/390.9319e40d.js"><link rel="prefetch" href="/assets/js/391.e2cc7ea6.js"><link rel="prefetch" href="/assets/js/392.10795946.js"><link rel="prefetch" href="/assets/js/393.c4574540.js"><link rel="prefetch" href="/assets/js/394.e1e83e03.js"><link rel="prefetch" href="/assets/js/395.c7e1eb57.js"><link rel="prefetch" href="/assets/js/396.1ea42313.js"><link rel="prefetch" href="/assets/js/397.e8061a94.js"><link rel="prefetch" href="/assets/js/398.ecadeab8.js"><link rel="prefetch" href="/assets/js/399.dea55ac6.js"><link rel="prefetch" href="/assets/js/4.a195f7b6.js"><link rel="prefetch" href="/assets/js/40.f82f0187.js"><link rel="prefetch" href="/assets/js/400.6717ff58.js"><link rel="prefetch" href="/assets/js/401.d4ea37f7.js"><link rel="prefetch" href="/assets/js/402.41fdc4b2.js"><link rel="prefetch" href="/assets/js/403.41057259.js"><link rel="prefetch" href="/assets/js/404.837b6b86.js"><link rel="prefetch" href="/assets/js/405.49c9c7c2.js"><link rel="prefetch" href="/assets/js/406.edc5636f.js"><link rel="prefetch" href="/assets/js/407.b35a76d2.js"><link rel="prefetch" href="/assets/js/408.ab25fe0c.js"><link rel="prefetch" href="/assets/js/409.af049984.js"><link rel="prefetch" href="/assets/js/41.54dfae4f.js"><link rel="prefetch" href="/assets/js/410.9303989e.js"><link rel="prefetch" href="/assets/js/411.dfe89d6e.js"><link rel="prefetch" href="/assets/js/412.489496d1.js"><link rel="prefetch" href="/assets/js/413.a678292f.js"><link rel="prefetch" href="/assets/js/414.42ff683c.js"><link rel="prefetch" href="/assets/js/415.fa70f3c6.js"><link rel="prefetch" href="/assets/js/416.c2b52841.js"><link rel="prefetch" href="/assets/js/417.59336c03.js"><link rel="prefetch" href="/assets/js/418.877f3b66.js"><link rel="prefetch" href="/assets/js/419.f37696a2.js"><link rel="prefetch" href="/assets/js/42.e6b0aae2.js"><link rel="prefetch" href="/assets/js/420.ba59678e.js"><link rel="prefetch" href="/assets/js/421.b0459232.js"><link rel="prefetch" href="/assets/js/422.82169579.js"><link rel="prefetch" href="/assets/js/423.5c1482d0.js"><link rel="prefetch" href="/assets/js/424.49711d9b.js"><link rel="prefetch" href="/assets/js/425.8c514fcb.js"><link rel="prefetch" href="/assets/js/426.72898cfc.js"><link rel="prefetch" href="/assets/js/427.66eb3fe5.js"><link rel="prefetch" href="/assets/js/428.a7bd466b.js"><link rel="prefetch" href="/assets/js/429.8fd5e3a8.js"><link rel="prefetch" href="/assets/js/43.3fff5a4c.js"><link rel="prefetch" href="/assets/js/430.eebb256a.js"><link rel="prefetch" href="/assets/js/431.58e8895f.js"><link rel="prefetch" href="/assets/js/432.3f20b681.js"><link rel="prefetch" href="/assets/js/433.44e82676.js"><link rel="prefetch" href="/assets/js/434.03aec36f.js"><link rel="prefetch" href="/assets/js/435.2830cd69.js"><link rel="prefetch" href="/assets/js/436.f2fd5b33.js"><link rel="prefetch" href="/assets/js/437.c4e29f95.js"><link rel="prefetch" href="/assets/js/438.2e47506b.js"><link rel="prefetch" href="/assets/js/439.04fc1a57.js"><link rel="prefetch" href="/assets/js/44.b334ed25.js"><link rel="prefetch" href="/assets/js/440.60166986.js"><link rel="prefetch" href="/assets/js/441.2e885d78.js"><link rel="prefetch" href="/assets/js/442.9d0ff896.js"><link rel="prefetch" href="/assets/js/443.e902f3b9.js"><link rel="prefetch" href="/assets/js/444.4f0d0db9.js"><link rel="prefetch" href="/assets/js/445.372dde37.js"><link rel="prefetch" href="/assets/js/446.c5500da6.js"><link rel="prefetch" href="/assets/js/447.6af1425e.js"><link rel="prefetch" href="/assets/js/448.e0a893f1.js"><link rel="prefetch" href="/assets/js/449.87a7d812.js"><link rel="prefetch" href="/assets/js/45.244b7680.js"><link rel="prefetch" href="/assets/js/450.3eca4d3a.js"><link rel="prefetch" href="/assets/js/451.cfb7d1c7.js"><link rel="prefetch" href="/assets/js/452.2b0b0c4d.js"><link rel="prefetch" href="/assets/js/453.a500efaa.js"><link rel="prefetch" href="/assets/js/454.4a4b5dcd.js"><link rel="prefetch" href="/assets/js/455.d267e970.js"><link rel="prefetch" href="/assets/js/456.159a5914.js"><link rel="prefetch" href="/assets/js/457.02916722.js"><link rel="prefetch" href="/assets/js/458.693c4b3f.js"><link rel="prefetch" href="/assets/js/459.f84cf410.js"><link rel="prefetch" href="/assets/js/46.508f7d41.js"><link rel="prefetch" href="/assets/js/460.4f109a5b.js"><link rel="prefetch" href="/assets/js/461.37187de1.js"><link rel="prefetch" href="/assets/js/462.4992918e.js"><link rel="prefetch" href="/assets/js/463.871e7e95.js"><link rel="prefetch" href="/assets/js/464.5aa364f7.js"><link rel="prefetch" href="/assets/js/465.07d0b35d.js"><link rel="prefetch" href="/assets/js/466.24947b1a.js"><link rel="prefetch" href="/assets/js/467.47ef006b.js"><link rel="prefetch" href="/assets/js/468.cee17164.js"><link rel="prefetch" href="/assets/js/469.fdad5e4c.js"><link rel="prefetch" href="/assets/js/47.e56ee397.js"><link rel="prefetch" href="/assets/js/470.b3ff2f13.js"><link rel="prefetch" href="/assets/js/471.d496e211.js"><link rel="prefetch" href="/assets/js/472.2063a068.js"><link rel="prefetch" href="/assets/js/473.aa6bd5ba.js"><link rel="prefetch" href="/assets/js/474.7978914b.js"><link rel="prefetch" href="/assets/js/475.4bbf0340.js"><link rel="prefetch" href="/assets/js/476.eb332b52.js"><link rel="prefetch" href="/assets/js/477.53ea6252.js"><link rel="prefetch" href="/assets/js/478.edbe4a47.js"><link rel="prefetch" href="/assets/js/479.5fb38387.js"><link rel="prefetch" href="/assets/js/48.bec9faeb.js"><link rel="prefetch" href="/assets/js/480.f21ff9e0.js"><link rel="prefetch" href="/assets/js/481.8e611064.js"><link rel="prefetch" href="/assets/js/482.6deda435.js"><link rel="prefetch" href="/assets/js/483.cfba6764.js"><link rel="prefetch" href="/assets/js/484.5f4e17f6.js"><link rel="prefetch" href="/assets/js/485.0cd6f0c8.js"><link rel="prefetch" href="/assets/js/486.7a12b540.js"><link rel="prefetch" href="/assets/js/487.4f121773.js"><link rel="prefetch" href="/assets/js/488.212fc60c.js"><link rel="prefetch" href="/assets/js/489.511c7934.js"><link rel="prefetch" href="/assets/js/49.f271ac34.js"><link rel="prefetch" href="/assets/js/490.40543b1e.js"><link rel="prefetch" href="/assets/js/491.b9e02614.js"><link rel="prefetch" href="/assets/js/492.7020aa9c.js"><link rel="prefetch" href="/assets/js/493.5bc91ef5.js"><link rel="prefetch" href="/assets/js/494.3893fb8a.js"><link rel="prefetch" href="/assets/js/495.3e35ddd8.js"><link rel="prefetch" href="/assets/js/496.50fe0e61.js"><link rel="prefetch" href="/assets/js/497.945b4bd3.js"><link rel="prefetch" href="/assets/js/498.90de0ef4.js"><link rel="prefetch" href="/assets/js/499.8e450b6e.js"><link rel="prefetch" href="/assets/js/5.2a4451ec.js"><link rel="prefetch" href="/assets/js/50.e60dabfc.js"><link rel="prefetch" href="/assets/js/500.aad8b0da.js"><link rel="prefetch" href="/assets/js/501.e576988e.js"><link rel="prefetch" href="/assets/js/502.9542d6db.js"><link rel="prefetch" href="/assets/js/503.a19eff50.js"><link rel="prefetch" href="/assets/js/504.202eb2e4.js"><link rel="prefetch" href="/assets/js/505.373f7fd0.js"><link rel="prefetch" href="/assets/js/506.8bb184a6.js"><link rel="prefetch" href="/assets/js/507.a94e3f42.js"><link rel="prefetch" href="/assets/js/508.d867192b.js"><link rel="prefetch" href="/assets/js/509.5e515932.js"><link rel="prefetch" href="/assets/js/51.65940de1.js"><link rel="prefetch" href="/assets/js/510.584925b9.js"><link rel="prefetch" href="/assets/js/511.9c23909a.js"><link rel="prefetch" href="/assets/js/512.4a1b0e80.js"><link rel="prefetch" href="/assets/js/513.eadca66a.js"><link rel="prefetch" href="/assets/js/514.b9045771.js"><link rel="prefetch" href="/assets/js/515.79043a80.js"><link rel="prefetch" href="/assets/js/516.f7834f37.js"><link rel="prefetch" href="/assets/js/517.cc500f62.js"><link rel="prefetch" href="/assets/js/518.b192a4a5.js"><link rel="prefetch" href="/assets/js/519.a3b03f32.js"><link rel="prefetch" href="/assets/js/52.d8e20165.js"><link rel="prefetch" href="/assets/js/520.8da09b22.js"><link rel="prefetch" href="/assets/js/521.93a8a062.js"><link rel="prefetch" href="/assets/js/522.c76d898b.js"><link rel="prefetch" href="/assets/js/523.8aed06fe.js"><link rel="prefetch" href="/assets/js/524.abd65c1f.js"><link rel="prefetch" href="/assets/js/525.3bd43a2b.js"><link rel="prefetch" href="/assets/js/526.35a12d3d.js"><link rel="prefetch" href="/assets/js/527.d1f03b8e.js"><link rel="prefetch" href="/assets/js/528.68b286e8.js"><link rel="prefetch" href="/assets/js/53.bf825409.js"><link rel="prefetch" href="/assets/js/54.2bd5a2fe.js"><link rel="prefetch" href="/assets/js/55.9d4b8667.js"><link rel="prefetch" href="/assets/js/56.aa94202c.js"><link rel="prefetch" href="/assets/js/57.031c737d.js"><link rel="prefetch" href="/assets/js/58.89130d49.js"><link rel="prefetch" href="/assets/js/59.96b86b80.js"><link rel="prefetch" href="/assets/js/6.3450075a.js"><link rel="prefetch" href="/assets/js/60.53b7d88b.js"><link rel="prefetch" href="/assets/js/61.0c0f12f7.js"><link rel="prefetch" href="/assets/js/62.2dc7dc16.js"><link rel="prefetch" href="/assets/js/63.3a66528e.js"><link rel="prefetch" href="/assets/js/64.ca5c6060.js"><link rel="prefetch" href="/assets/js/65.5832f0ec.js"><link rel="prefetch" href="/assets/js/66.d486a91a.js"><link rel="prefetch" href="/assets/js/67.2a47c8f6.js"><link rel="prefetch" href="/assets/js/68.38ac76fc.js"><link rel="prefetch" href="/assets/js/69.7f8c7118.js"><link rel="prefetch" href="/assets/js/7.c5c54fb4.js"><link rel="prefetch" href="/assets/js/70.368e2128.js"><link rel="prefetch" href="/assets/js/71.79ab0b38.js"><link rel="prefetch" href="/assets/js/72.b43649cf.js"><link rel="prefetch" href="/assets/js/73.0478a06c.js"><link rel="prefetch" href="/assets/js/74.d200c141.js"><link rel="prefetch" href="/assets/js/75.2c99b650.js"><link rel="prefetch" href="/assets/js/76.316509fa.js"><link rel="prefetch" href="/assets/js/77.e6edd439.js"><link rel="prefetch" href="/assets/js/78.4dc668e5.js"><link rel="prefetch" href="/assets/js/79.036924ec.js"><link rel="prefetch" href="/assets/js/8.de5c69e7.js"><link rel="prefetch" href="/assets/js/80.293948a6.js"><link rel="prefetch" href="/assets/js/81.fcfc5c23.js"><link rel="prefetch" href="/assets/js/82.362d02a9.js"><link rel="prefetch" href="/assets/js/83.c4dbb547.js"><link rel="prefetch" href="/assets/js/84.f08949cb.js"><link rel="prefetch" href="/assets/js/85.f2e4448e.js"><link rel="prefetch" href="/assets/js/86.fbd4f3d9.js"><link rel="prefetch" href="/assets/js/87.afc9310c.js"><link rel="prefetch" href="/assets/js/88.d7486a20.js"><link rel="prefetch" href="/assets/js/89.f0d0304a.js"><link rel="prefetch" href="/assets/js/9.18fb6454.js"><link rel="prefetch" href="/assets/js/90.b9f22784.js"><link rel="prefetch" href="/assets/js/91.6878b587.js"><link rel="prefetch" href="/assets/js/92.295618c2.js"><link rel="prefetch" href="/assets/js/93.ae3dfa9b.js"><link rel="prefetch" href="/assets/js/94.cf487101.js"><link rel="prefetch" href="/assets/js/95.427e00a4.js"><link rel="prefetch" href="/assets/js/96.2a84236c.js"><link rel="prefetch" href="/assets/js/97.6767cf86.js"><link rel="prefetch" href="/assets/js/98.77656225.js"><link rel="prefetch" href="/assets/js/99.902cfc13.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.eff714eb.js"> |
| <link rel="stylesheet" href="/assets/css/0.styles.ccadf850.css"> |
| </head> |
| <body> |
| <div id="app" data-server-rendered="true"><div class="theme-container"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/" class="home-link router-link-active"><img src="/img/logo.png" alt=" " class="logo"></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Document</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.8.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.8.x</a></li></ul></div></div><div class="nav-item"><a href="/SystemDesign/Architecture/Architecture.html" class="nav-link">System design</a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external"> |
| Wiki |
| <!----></a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Project Committers.html" class="nav-link">People</a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Powered By.html" class="nav-link">Powered By</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">Resources</a></li><li class="dropdown-item"><!----> <a href="/Community/Feedback.html" class="nav-link">Feedback</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Development</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Development/VoteRelease.html" class="nav-link">How to vote</a></li><li class="dropdown-item"><!----> <a href="/Development/HowToCommit.html" class="nav-link">How to Commit</a></li><li class="dropdown-item"><!----> <a href="/Development/Committer.html" class="nav-link">Become a Committer</a></li><li class="dropdown-item"><!----> <a href="/Development/ContributeGuide.html" class="nav-link">ContributeGuide</a></li><li class="dropdown-item"><!----> <a href="/Development/format-changelist.html" class="nav-link">Changelist of TsFile</a></li><li class="dropdown-item"><!----> <a href="/Development/rpc-changelist.html" class="nav-link">Changelist of RPC</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Blog</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Blog/Index.html" class="nav-link">Overview</a></li><li class="dropdown-item"><!----> <a href="/Blog/Release0_93.html" class="nav-link">Some Notes on Release 0.9.3 and upcoming 0.10.0</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">ASF</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="http://www.apache.org/" class="nav-link external"> |
| Foundation |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external"> |
| License |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external"> |
| Security |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external"> |
| Sponsorship |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external"> |
| Thanks |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external"> |
| Current Events |
| <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/5-Operation Manual/4-SQL Reference.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.9.x/5-Operation Manual/4-SQL Reference.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link"> |
| gitHub |
| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav></div></header> <div class="sidebar-mask"></div> <aside class="sidebar"><nav class="nav-links"><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Document</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.8.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.8.x</a></li></ul></div></div><div class="nav-item"><a href="/SystemDesign/Architecture/Architecture.html" class="nav-link">System design</a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external"> |
| Wiki |
| <!----></a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Project Committers.html" class="nav-link">People</a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Powered By.html" class="nav-link">Powered By</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">Resources</a></li><li class="dropdown-item"><!----> <a href="/Community/Feedback.html" class="nav-link">Feedback</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Development</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Development/VoteRelease.html" class="nav-link">How to vote</a></li><li class="dropdown-item"><!----> <a href="/Development/HowToCommit.html" class="nav-link">How to Commit</a></li><li class="dropdown-item"><!----> <a href="/Development/Committer.html" class="nav-link">Become a Committer</a></li><li class="dropdown-item"><!----> <a href="/Development/ContributeGuide.html" class="nav-link">ContributeGuide</a></li><li class="dropdown-item"><!----> <a href="/Development/format-changelist.html" class="nav-link">Changelist of TsFile</a></li><li class="dropdown-item"><!----> <a href="/Development/rpc-changelist.html" class="nav-link">Changelist of RPC</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Blog</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Blog/Index.html" class="nav-link">Overview</a></li><li class="dropdown-item"><!----> <a href="/Blog/Release0_93.html" class="nav-link">Some Notes on Release 0.9.3 and upcoming 0.10.0</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">ASF</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="http://www.apache.org/" class="nav-link external"> |
| Foundation |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external"> |
| License |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external"> |
| Security |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external"> |
| Sponsorship |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external"> |
| Thanks |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external"> |
| Current Events |
| <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/5-Operation Manual/4-SQL Reference.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.9.x/5-Operation Manual/4-SQL Reference.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link"> |
| gitHub |
| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB User Guide (V0.9.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>0-Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1-Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2-Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-Server</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>4-Client</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>5-Operation Manual</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.9.x/5-Operation Manual/1-DDL Data Definition Language.html" class="sidebar-link">DDL (Data Definition Language)</a></li><li><a href="/UserGuide/V0.9.x/5-Operation Manual/2-DML Data Manipulation Language.html" class="sidebar-link">DML (Data Manipulation Language)</a></li><li><a href="/UserGuide/V0.9.x/5-Operation Manual/3-Account Management Statements.html" class="sidebar-link">Account Management Statements</a></li><li><a href="/UserGuide/V0.9.x/5-Operation Manual/4-SQL Reference.html" class="active sidebar-link">SQL Reference</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>7-Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>8-System Design</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="sql-reference"><a href="#sql-reference" class="header-anchor">#</a> SQL Reference</h1> <p>In this part, we will introduce you IoTDB's Query Language. IoTDB offers you a SQL-like query language for interacting with IoTDB, the query language can be devided into 4 major parts:</p> <ul><li>Schema Statement: statements about schema management are all listed in this section.</li> <li>Data Management Statement: statements about data management (such as: data insertion, data query, etc.) are all listed in this section.</li> <li>Database Management Statement: statements about database management and authentication are all listed in this section.</li> <li>Functions: functions that IoTDB offers are all listed in this section.</li></ul> <p>All of these statements are write in IoTDB's own syntax, for details about the syntax composition, please check the <code>Reference</code> section.</p> <h2 id="show-version"><a href="#show-version" class="header-anchor">#</a> Show Version</h2> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">show</span> version |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>+---------------------------------------------------------------------------+ |
| | 0.9.3| |
| +---------------------------------------------------------------------------+ |
| It costs 0.001s |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="schema-statement"><a href="#schema-statement" class="header-anchor">#</a> Schema Statement</h2> <ul><li>Set Storage Group</li></ul> <div class="language-SQL line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">SET</span> STORAGE <span class="token keyword">GROUP</span> <span class="token keyword">TO</span> <span class="token operator"><</span>PrefixPath<span class="token operator">></span> |
| Eg: IoTDB <span class="token operator">></span> <span class="token keyword">SET</span> STORAGE <span class="token keyword">GROUP</span> <span class="token keyword">TO</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf01<span class="token punctuation">.</span>wt01 |
| Note: PrefixPath can <span class="token operator">not</span> include <span class="token punctuation">`</span><span class="token operator">*</span><span class="token punctuation">`</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Delete Storage Group</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>DELETE STORAGE GROUP <PrefixPath> [COMMA <PrefixPath>]* |
| Eg: IoTDB > DELETE STORAGE GROUP root.ln.wf01.wt01 |
| Eg: IoTDB > DELETE STORAGE GROUP root.ln.wf01.wt01, root.ln.wf01.wt02 |
| Note: PrefixPath can not include `*` |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>Create Timeseries Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>CREATE TIMESERIES <Timeseries> WITH <AttributeClauses> |
| AttributeClauses : DATATYPE=<DataTypeValue> COMMA ENCODING=<EncodingValue> [COMMA <ExtraAttributeClause>]* |
| DataTypeValue: BOOLEAN | DOUBLE | FLOAT | INT32 | INT64 | TEXT |
| EncodingValue: GORILLA | PLAIN | RLE | TS_2DIFF | REGULAR |
| ExtraAttributeClause: { |
| COMPRESSOR = <CompressorValue> |
| MAX_POINT_NUMBER = Integer |
| } |
| CompressorValue: UNCOMPRESSED | SNAPPY |
| Eg: IoTDB > CREATE TIMESERIES root.ln.wf01.wt01.status WITH DATATYPE=BOOLEAN, ENCODING=PLAIN |
| Eg: IoTDB > CREATE TIMESERIES root.ln.wf01.wt01.temperature WITH DATATYPE=FLOAT, ENCODING=RLE |
| Eg: IoTDB > CREATE TIMESERIES root.ln.wf01.wt01.temperature WITH DATATYPE=FLOAT, ENCODING=RLE, COMPRESSOR=SNAPPY, MAX_POINT_NUMBER=3 |
| Note: Datatype and encoding type must be corresponding. Please check Chapter 3 Encoding Section for details. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><ul><li>Delete Timeseries Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>DELETE TIMESERIES <PrefixPath> [COMMA <PrefixPath>]* |
| Eg: IoTDB > DELETE TIMESERIES root.ln.wf01.wt01.status |
| Eg: IoTDB > DELETE TIMESERIES root.ln.wf01.wt01.status, root.ln.wf01.wt01.temperature |
| Eg: IoTDB > DELETE TIMESERIES root.ln.wf01.wt01.* |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>Show All Timeseries Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW TIMESERIES |
| Eg: IoTDB > SHOW TIMESERIES |
| Note: This statement can only be used in IoTDB Client. If you need to show all timeseries in JDBC, please use `DataBaseMetadata` interface. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Show Specific Timeseries Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW TIMESERIES <Path> |
| Eg: IoTDB > SHOW TIMESERIES root |
| Eg: IoTDB > SHOW TIMESERIES root.ln |
| Eg: IoTDB > SHOW TIMESERIES root.ln.*.*.status |
| Eg: IoTDB > SHOW TIMESERIES root.ln.wf01.wt01.status |
| Note: The path can be prefix path, star path or timeseries path |
| Note: This statement can be used in IoTDB Client and JDBC. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><ul><li>Show Storage Group Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW STORAGE GROUP |
| Eg: IoTDB > SHOW STORAGE GROUP |
| Note: This statement can be used in IoTDB Client and JDBC. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Count Timeseries Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>COUNT TIMESERIES <Path> |
| Eg: IoTDB > COUNT TIMESERIES root |
| Eg: IoTDB > COUNT TIMESERIES root.ln |
| Eg: IoTDB > COUNT TIMESERIES root.ln.*.*.status |
| Eg: IoTDB > COUNT TIMESERIES root.ln.wf01.wt01.status |
| Note: The path can be prefix path, star path or timeseries path. |
| Note: This statement can be used in IoTDB Client and JDBC. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>COUNT TIMESERIES <Path> GROUP BY LEVEL=<INTEGER> |
| Eg: IoTDB > COUNT TIMESERIES root GROUP BY LEVEL=1 |
| Eg: IoTDB > COUNT TIMESERIES root.ln GROUP BY LEVEL=2 |
| Eg: IoTDB > COUNT TIMESERIES root.ln.wf01 GROUP BY LEVEL=3 |
| Note: The path can be prefix path or timeseries path. |
| Note: This statement can be used in IoTDB Client and JDBC. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><ul><li>Count Nodes Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>COUNT NODES <Path> LEVEL=<INTEGER> |
| Eg: IoTDB > COUNT NODES root LEVEL=2 |
| Eg: IoTDB > COUNT NODES root.ln LEVEL=2 |
| Eg: IoTDB > COUNT NODES root.ln.wf01 LEVEL=3 |
| Note: The path can be prefix path or timeseries path. |
| Note: This statement can be used in IoTDB Client and JDBC. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><ul><li>Show All Devices Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW Devices |
| Eg: IoTDB > SHOW Devices |
| Note: This statement can be used in IoTDB Client and JDBC. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Show Specific Devices Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW DEVICES <PrefixPath> |
| Eg: IoTDB > SHOW DEVICES root |
| Eg: IoTDB > SHOW DEVICES root.ln |
| Eg: IoTDB > SHOW DEVICES root.*.wf01 |
| Note: The path can be prefix path or star path. |
| Note: This statement can be used in IoTDB Client and JDBC. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><ul><li>Show Child Paths of Root Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW CHILD PATHS |
| Eg: IoTDB > SHOW CHILD PATHS |
| Note: This statement can be used in IoTDB Client and JDBC. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Show Child Paths Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW CHILD PATHS <Path> |
| Eg: IoTDB > SHOW CHILD PATHS root |
| Eg: IoTDB > SHOW CHILD PATHS root.ln |
| Eg: IoTDB > SHOW CHILD PATHS root.ln.wf01 |
| Note: The path can only be prefix path. |
| Note: This statement can be used in IoTDB Client and JDBC. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h2 id="data-management-statement"><a href="#data-management-statement" class="header-anchor">#</a> Data Management Statement</h2> <ul><li>Insert Record Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>INSERT INTO <PrefixPath> LPAREN TIMESTAMP COMMA <Sensor> [COMMA <Sensor>]* RPAREN VALUES LPAREN <TimeValue>, <PointValue> [COMMA <PointValue>]* RPAREN |
| Sensor : Identifier |
| Eg: IoTDB > INSERT INTO root.ln.wf01.wt01(timestamp,status) values(1509465600000,true) |
| Eg: IoTDB > INSERT INTO root.ln.wf01.wt01(timestamp,status) VALUES(NOW(), false) |
| Eg: IoTDB > INSERT INTO root.ln.wf01.wt01(timestamp,temperature) VALUES(2017-11-01T00:17:00.000+08:00,24.22028) |
| Eg: IoTDB > INSERT INTO root.ln.wf01.wt01(timestamp, status, temperature) VALUES (1509466680000, false, 20.060787); |
| Note: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries> |
| Note: The order of Sensor and PointValue need one-to-one correspondence |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><ul><li>Update Record Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>UPDATE <UpdateClause> SET <SetClause> WHERE <WhereClause> |
| UpdateClause: <prefixPath> |
| SetClause: <SetExpression> |
| SetExpression: <Path> EQUAL <PointValue> |
| WhereClause : <Condition> [(AND | OR) <Condition>]* |
| Condition : <Expression> [(AND | OR) <Expression>]* |
| Expression : [NOT | !]? TIME PrecedenceEqualOperator <TimeValue> |
| Eg: IoTDB > UPDATE root.ln.wf01.wt01 SET temperature = 23 WHERE time < NOW() and time > 2017-11-1T00:15:00+08:00 |
| Note: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><ul><li>Delete Record Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>DELETE FROM <PrefixPath> [COMMA <PrefixPath>]* WHERE TIME LESSTHAN <TimeValue> |
| Eg: DELETE FROM root.ln.wf01.wt01.temperature WHERE time < 2017-11-1T00:05:00+08:00 |
| Eg: DELETE FROM root.ln.wf01.wt01.status, root.ln.wf01.wt01.temperature WHERE time < NOW() |
| Eg: DELETE FROM root.ln.wf01.wt01.* WHERE time < 1509466140000 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>Select Record Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT <SelectClause> FROM <FromClause> [WHERE <WhereClause>]? |
| SelectClause : <SelectPath> (COMMA <SelectPath>)* |
| SelectPath : <FUNCTION> LPAREN <Path> RPAREN | <Path> |
| FUNCTION : ‘COUNT’ , ‘MIN_TIME’, ‘MAX_TIME’, ‘MIN_VALUE’, ‘MAX_VALUE’ |
| FromClause : <PrefixPath> (COMMA <PrefixPath>)? |
| WhereClause : <Condition> [(AND | OR) <Condition>]* |
| Condition : <Expression> [(AND | OR) <Expression>]* |
| Expression : [NOT | !]? <TimeExpr> | [NOT | !]? <SensorExpr> |
| TimeExpr : TIME PrecedenceEqualOperator (<TimeValue> | <RelativeTime>) |
| RelativeTimeDurationUnit = Integer ('Y'|'MO'|'W'|'D'|'H'|'M'|'S'|'MS'|'US'|'NS') |
| RelativeTime : (now() | <TimeValue>) [(+|-) RelativeTimeDurationUnit]+ |
| SensorExpr : (<Timeseries> | <Path>) PrecedenceEqualOperator <PointValue> |
| Eg: IoTDB > SELECT status, temperature FROM root.ln.wf01.wt01 WHERE temperature < 24 and time > 2017-11-1 0:13:00 |
| Eg. IoTDB > SELECT * FROM root |
| Eg. IoTDB > SELECT * FROM root where time > now() - 5m |
| Eg. IoTDB > SELECT COUNT(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 25 |
| Eg. IoTDB > SELECT MIN_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 25 |
| Eg. IoTDB > SELECT MAX_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature > 24 |
| Eg. IoTDB > SELECT MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature > 23 |
| Eg. IoTDB > SELECT MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 25 |
| Note: the statement needs to satisfy this constraint: <Path>(SelectClause) + <PrefixPath>(FromClause) = <Timeseries> |
| Note: If the <SensorExpr>(WhereClause) is started with <Path> and not with ROOT, the statement needs to satisfy this constraint: <PrefixPath>(FromClause) + <Path>(SensorExpr) = <Timeseries> |
| Note: In Version 0.7.0, if <WhereClause> includes `OR`, time filter can not be used. |
| Note: There must be a space on both sides of the plus and minus operator appearing in the time expression |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br></div></div><ul><li>Group By Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT <SelectClause> FROM <FromClause> WHERE <WhereClause> GROUP BY <GroupByClause> |
| SelectClause : <Function> [COMMA < Function >]* |
| Function : <AggregationFunction> LPAREN <Path> RPAREN |
| FromClause : <PrefixPath> |
| WhereClause : <Condition> [(AND | OR) <Condition>]* |
| Condition : <Expression> [(AND | OR) <Expression>]* |
| Expression : [NOT | !]? <TimeExpr> | [NOT | !]? <SensorExpr> |
| TimeExpr : TIME PrecedenceEqualOperator (<TimeValue> | <RelativeTime>) |
| RelativeTimeDurationUnit = Integer ('Y'|'MO'|'W'|'D'|'H'|'M'|'S'|'MS'|'US'|'NS') |
| RelativeTime : (now() | <TimeValue>) [(+|-) RelativeTimeDurationUnit]+ |
| SensorExpr : (<Timeseries> | <Path>) PrecedenceEqualOperator <PointValue> |
| GroupByClause : LPAREN <TimeUnit> (COMMA TimeValue)? COMMA <TimeInterval> (COMMA <TimeInterval>)* RPAREN |
| TimeUnit : Integer <DurationUnit> |
| DurationUnit : "ms" | "s" | "m" | "h" | "d" | "w" |
| TimeInterval: LBRACKET <TimeValue> COMMA <TimeValue> RBRACKET |
| Eg: SELECT COUNT(status), COUNT(temperature) FROM root.ln.wf01.wt01 where temperature < 24 GROUP BY(5m, [1509465720000, 1509466380000]) |
| Eg. SELECT COUNT (status), MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE time < 1509466500000 GROUP BY(5m, 1509465660000, [1509465720000, 1509466380000]) |
| Eg. SELECT MIN_TIME(status), MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE temperature < 25 and time < 1509466800000 GROUP BY (3m, 1509465600000, [1509466140000, 1509466380000], [1509466440000, 1509466620000]) |
| Note: the statement needs to satisfy this constraint: <Path>(SelectClause) + <PrefixPath>(FromClause) = <Timeseries> |
| Note: If the <SensorExpr>(WhereClause) is started with <Path> and not with ROOT, the statement needs to satisfy this constraint: <PrefixPath>(FromClause) + <Path>(SensorExpr) = <Timeseries> |
| Note: <TimeValue>(TimeInterval) needs to be greater than 0 |
| Note: First <TimeValue>(TimeInterval) in needs to be smaller than second <TimeValue>(TimeInterval) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br></div></div><ul><li>Fill Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT <SelectClause> FROM <FromClause> WHERE <WhereClause> FILL <FillClause> |
| SelectClause : <Path> [COMMA <Path>]* |
| FromClause : < PrefixPath > [COMMA < PrefixPath >]* |
| WhereClause : <WhereExpression> |
| WhereExpression : TIME EQUAL <TimeValue> |
| FillClause : LPAREN <TypeClause> [COMMA <TypeClause>]* RPAREN |
| TypeClause : <Int32Clause> | <Int64Clause> | <FloatClause> | <DoubleClause> | <BoolClause> | <TextClause> |
| Int32Clause: INT32 LBRACKET (<LinearClause> | <PreviousClause>) RBRACKET |
| Int64Clause: INT64 LBRACKET (<LinearClause> | <PreviousClause>) RBRACKET |
| FloatClause: FLOAT LBRACKET (<LinearClause> | <PreviousClause>) RBRACKET |
| DoubleClause: DOUBLE LBRACKET (<LinearClause> | <PreviousClause>) RBRACKET |
| BoolClause: BOOLEAN LBRACKET (<LinearClause> | <PreviousClause>) RBRACKET |
| TextClause: TEXT LBRACKET (<LinearClause> | <PreviousClause>) RBRACKET |
| PreviousClause : PREVIOUS [COMMA <ValidPreviousTime>]? |
| LinearClause : LINEAR [COMMA <ValidPreviousTime> COMMA <ValidBehindTime>]? |
| ValidPreviousTime, ValidBehindTime: <TimeUnit> |
| TimeUnit : Integer <DurationUnit> |
| DurationUnit : "ms" | "s" | "m" | "h" | "d" | "w" |
| Eg: SELECT temperature FROM root.ln.wf01.wt01 WHERE time = 2017-11-01T16:37:50.000 FILL(float[previous, 1m]) |
| Eg: SELECT temperature,status FROM root.ln.wf01.wt01 WHERE time = 2017-11-01T16:37:50.000 FILL (float[linear, 1m, 1m], boolean[previous, 1m]) |
| Eg: SELECT temperature,status,hardware FROM root.ln.wf01.wt01 WHERE time = 2017-11-01T16:37:50.000 FILL (float[linear, 1m, 1m], boolean[previous, 1m], text[previous]) |
| Eg: SELECT temperature,status,hardware FROM root.ln.wf01.wt01 WHERE time = 2017-11-01T16:37:50.000 FILL (float[linear], boolean[previous, 1m], text[previous]) |
| Note: the statement needs to satisfy this constraint: <PrefixPath>(FromClause) + <Path>(SelectClause) = <Timeseries> |
| Note: Integer in <TimeUnit> needs to be greater than 0 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br></div></div><ul><li>Limit Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT <SelectClause> FROM <FromClause> [WHERE <WhereClause>] [LIMIT <LIMITClause>] [SLIMIT <SLIMITClause>] |
| SelectClause : [<Path> | Function]+ |
| Function : <AggregationFunction> LPAREN <Path> RPAREN |
| FromClause : <Path> |
| WhereClause : <Condition> [(AND | OR) <Condition>]* |
| Condition : <Expression> [(AND | OR) <Expression>]* |
| Expression: [NOT|!]?<TimeExpr> | [NOT|!]?<SensorExpr> |
| TimeExpr : TIME PrecedenceEqualOperator (<TimeValue> | <RelativeTime>) |
| RelativeTimeDurationUnit = Integer ('Y'|'MO'|'W'|'D'|'H'|'M'|'S'|'MS'|'US'|'NS') |
| RelativeTime : (now() | <TimeValue>) [(+|-) RelativeTimeDurationUnit]+ |
| SensorExpr : (<Timeseries>|<Path>) PrecedenceEqualOperator <PointValue> |
| LIMITClause : <N> [OFFSETClause]? |
| N : PositiveInteger |
| OFFSETClause : OFFSET <OFFSETValue> |
| OFFSETValue : NonNegativeInteger |
| SLIMITClause : <SN> [SOFFSETClause]? |
| SN : PositiveInteger |
| SOFFSETClause : SOFFSET <SOFFSETValue> |
| SOFFSETValue : NonNegativeInteger |
| NonNegativeInteger:= ('+')? Digit+ |
| Eg: IoTDB > SELECT status, temperature FROM root.ln.wf01.wt01 WHERE temperature < 24 and time > 2017-11-1 0:13:00 LIMIT 3 OFFSET 2 |
| Eg. IoTDB > SELECT COUNT (status), MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE time < 1509466500000 GROUP BY(5m, 1509465660000, [1509465720000, 1509466380000]) LIMIT 3 |
| Note: The order of <LIMITClause> and <SLIMITClause> does not affect the grammatical correctness. |
| Note: <FillClause> can not use <LIMITClause> but not <SLIMITClause>. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br></div></div><ul><li>Group By Device Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>GroupbyDeviceClause : GROUP BY DEVICE |
| |
| Rules: |
| 1. Both uppercase and lowercase are ok. |
| Correct example: select * from root.sg1 group by device |
| Correct example: select * from root.sg1 GROUP BY DEVICE |
| |
| 2. GroupbyDeviceClause can only be used at the end of a query statement. |
| Correct example: select * from root.sg1 where time > 10 group by device |
| Wrong example: select * from root.sg1 group by device where time > 10 |
| |
| 3. The paths of the SELECT clause can only be single level. In other words, the paths of the SELECT clause can only be measurements or STAR, without DOT. |
| Correct example: select s0,s1 from root.sg1.* group by device |
| Correct example: select s0,s1 from root.sg1.d0, root.sg1.d1 group by device |
| Correct example: select * from root.sg1.* group by device |
| Correct example: select * from root group by device |
| Correct example: select s0,s1,* from root.*.* group by device |
| Wrong example: select d0.s1, d0.s2, d1.s0 from root.sg1 group by device |
| Wrong example: select *.s0, *.s1 from root.* group by device |
| Wrong example: select *.*.* from root group by device |
| |
| 4. The data types of the same measurement column should be the same across devices. |
| Note that when it comes to aggregated paths, the data type of the measurement column will reflect |
| the aggregation function rather than the original timeseries. |
| |
| Correct example: select s0 from root.sg1.d0,root.sg1.d1 group by device |
| root.sg1.d0.s0 and root.sg1.d1.s0 are both INT32. |
| |
| Correct example: select count(s0) from root.sg1.d0,root.sg1.d1 group by device |
| count(root.sg1.d0.s0) and count(root.sg1.d1.s0) are both INT64. |
| |
| Wrong example: select s0 from root.sg1.d0, root.sg2.d3 group by device |
| root.sg1.d0.s0 is INT32 while root.sg2.d3.s0 is FLOAT. |
| |
| 5. The display principle of the result table is that only when the column (or row) has existing data will the column (or row) be shown, with nonexistent cells being null. |
| For example, "select s0,s1,s2 from root.sg.d0, root.sg.d1, root.sg.d2 group by device". Suppose that the actual existing timeseries are as follows: |
| - root.sg.d0.s0 |
| - root.sg.d0.s1 |
| - root.sg.d1.s0 |
| |
| Then the header of the result table will be: [Time, Device, s0, s1]. |
| And you could expect a table like: |
| |
| | Time | Device | s0 | s1 | |
| | --- | --- | ---| ---| |
| | 1 |root.sg.d0| 20 | 2.5| |
| | 2 |root.sg.d0| 23 | 3.1| |
| | ... | ... | ...| ...| |
| | 1 |root.sg.d1| 12 |null| |
| | 2 |root.sg.d1| 19 |null| |
| | ... | ... | ...| ...| |
| |
| Note that the cells of measurement 's0' and device 'root.sg.d1' are all null. |
| Also note that the column of 's2' and the rows of 'root.sg.d2' are not existent. |
| |
| 6. The duplicated devices in the prefix paths are neglected. |
| For example, "select s0,s1 from root.sg.d0,root.sg.d0,root.sg.d1 group by device" is equal to "select s0,s1 from root.sg.d0,root.sg.d1 group by device". |
| For example. "select s0,s1 from root.sg.*,root.sg.d0 group by device" is equal to "select s0,s1 from root.sg.* group by device". |
| |
| 7. The duplicated measurements in the suffix paths are not neglected. |
| For example, "select s0,s0,s1 from root.sg.* group by device" is not equal to "select s0,s1 from root.sg.* group by device". |
| |
| 8. More correct examples: |
| - select * from root.vehicle group by device |
| - select s0,s0,s1 from root.vehicle.* group by device |
| - select s0,s1 from root.vehicle.* limit 10 offset 1 group by device |
| - select * from root.vehicle slimit 10 soffset 2 group by device |
| - select * from root.vehicle where time > 10 group by device |
| - select * from root.vehicle where root.vehicle.d0.s0>0 group by device |
| - select count(*) from root.vehicle group by device |
| - select sum(*) from root.vehicle GROUP BY (20ms,0,[2,50]) group by device |
| - select * from root.vehicle where time = 3 Fill(int32[previous, 5ms]) group by device |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br></div></div><h2 id="database-management-statement"><a href="#database-management-statement" class="header-anchor">#</a> Database Management Statement</h2> <ul><li>Create User</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>CREATE USER <userName> <password>; |
| userName:=identifier |
| password:=string |
| Eg: IoTDB > CREATE USER thulab 'pwd'; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>Delete User</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>DROP USER <userName>; |
| userName:=identifier |
| Eg: IoTDB > DROP USER xiaoming; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Create Role</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>CREATE ROLE <roleName>; |
| roleName:=identifie |
| Eg: IoTDB > CREATE ROLE admin; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Delete Role</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>DROP ROLE <roleName>; |
| roleName:=identifier |
| Eg: IoTDB > DROP ROLE admin; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Grant User Privileges</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>GRANT USER <userName> PRIVILEGES <privileges> ON <nodeName>; |
| userName:=identifier |
| nodeName:=identifier (DOT identifier)* |
| privileges:= string (COMMA string)* |
| Eg: IoTDB > GRANT USER tempuser PRIVILEGES 'DELETE_TIMESERIES' on root.ln; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>Grant Role Privileges</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>GRANT ROLE <roleName> PRIVILEGES <privileges> ON <nodeName>; |
| privileges:= string (COMMA string)* |
| roleName:=identifier |
| nodeName:=identifier (DOT identifier)* |
| Eg: IoTDB > GRANT ROLE temprole PRIVILEGES 'DELETE_TIMESERIES' ON root.ln; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>Grant User Role</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>GRANT <roleName> TO <userName>; |
| roleName:=identifier |
| userName:=identifier |
| Eg: IoTDB > GRANT temprole TO tempuser; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>Revoke User Privileges</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>REVOKE USER <userName> PRIVILEGES <privileges> ON <nodeName>; |
| privileges:= string (COMMA string)* |
| userName:=identifier |
| nodeName:=identifier (DOT identifier)* |
| Eg: IoTDB > REVOKE USER tempuser PRIVILEGES 'DELETE_TIMESERIES' on root.ln; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>Revoke Role Privileges</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>REVOKE ROLE <roleName> PRIVILEGES <privileges> ON <nodeName>; |
| privileges:= string (COMMA string)* |
| roleName:= identifier |
| nodeName:=identifier (DOT identifier)* |
| Eg: IoTDB > REVOKE ROLE temprole PRIVILEGES 'DELETE_TIMESERIES' ON root.ln; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>Revoke Role From User</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>REVOKE <roleName> FROM <userName>; |
| roleName:=identifier |
| userName:=identifier |
| Eg: IoTDB > REVOKE temproleFROM tempuser; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>List Users</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST USER |
| Eg: IoTDB > LIST USER |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><ul><li>List Roles</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST ROLE |
| Eg: IoTDB > LIST ROLE |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><ul><li>List Privileges</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST PRIVILEGES USER <username> ON <path>; |
| username:=identifier |
| path=‘root’ (DOT identifier)* |
| Eg: IoTDB > LIST PRIVIEGES USER sgcc_wirte_user ON root.sgcc; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>List Privileges of Roles(On Specific Path)</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST PRIVILEGES ROLE <roleName> ON <path>; |
| roleName:=identifier |
| path=‘root’ (DOT identifier)* |
| Eg: IoTDB > LIST PRIVIEGES ROLE wirte_role ON root.sgcc; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>List Privileges of Users</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST USER PRIVILEGES <username> ; |
| username:=identifier |
| Eg: IoTDB > LIST USER PRIVIEGES tempuser; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>List Privileges of Roles</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST ROLE PRIVILEGES <roleName> |
| roleName:=identifier |
| Eg: IoTDB > LIST ROLE PRIVIEGES actor; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>List Roles of Users</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST ALL ROLE OF USER <username> ; |
| username:=identifier |
| Eg: IoTDB > LIST ALL ROLE OF USER tempuser; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>List Users of Role</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST ALL USER OF ROLE <roleName>; |
| roleName:=identifier |
| Eg: IoTDB > LIST ALL USER OF ROLE roleuser; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Alter Password</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>ALTER USER <username> SET PASSWORD <password>; |
| roleName:=identifier |
| password:=identifier |
| Eg: IoTDB > ALTER USER tempuser SET PASSWORD 'newpwd'; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="functions"><a href="#functions" class="header-anchor">#</a> Functions</h2> <ul><li>COUNT</li></ul> <p>The COUNT function returns the value number of timeseries(one or more) non-null values selected by the SELECT statement. The result is a signed 64-bit integer. If there are no matching rows, COUNT () returns 0.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT COUNT(Path) (COMMA COUNT(Path))* FROM <FromClause> [WHERE <WhereClause>]? |
| Eg. SELECT COUNT(status), COUNT(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24 |
| Note: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>FIRST</li></ul> <p>The FIRST function returns the first point value of the choosen timeseries(one or more).</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT FIRST (Path) (COMMA FIRST (Path))* FROM <FromClause> [WHERE <WhereClause>]? |
| Eg. SELECT FIRST (status), FIRST (temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24 |
| Note: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>MAX_TIME</li></ul> <p>The MAX_TIME function returns the maximum timestamp of the choosen timeseries(one or more). The result is a signed 64-bit integer, greater than 0.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT MAX_TIME (Path) (COMMA MAX_TIME (Path))* FROM <FromClause> [WHERE <WhereClause>]? |
| Eg. SELECT MAX_TIME(status), MAX_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24 |
| Note: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>MAX_VALUE</li></ul> <p>The MAX_VALUE function returns the maximum value(lexicographically ordered) of the choosen timeseries (one or more).</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT MAX_VALUE (Path) (COMMA MAX_VALUE (Path))* FROM <FromClause> [WHERE <WhereClause>]? |
| Eg. SELECT MAX_VALUE(status), MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24 |
| Note: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>AVG(Rename from <code>MEAN</code> at <code>V0.9.0</code>)</li></ul> <p>The AVG function returns the arithmetic mean value of the choosen timeseries over a specified period of time. The timeseries must be int32, int64, float, double type, and the other types are not to be calculated. The result is a double type number.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT AVG (Path) (COMMA AVG (Path))* FROM <FromClause> [WHERE <WhereClause>]? |
| Eg. SELECT AVG (temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24 |
| Note: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>MIN_TIME</li></ul> <p>The MIN_TIME function returns the minimum timestamp of the choosen timeseries(one or more). The result is a signed 64-bit integer, greater than 0.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT MIN_TIME (Path) (COMMA MIN_TIME (Path))*FROM <FromClause> [WHERE <WhereClause>]? |
| Eg. SELECT MIN_TIME(status), MIN_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24 |
| Note: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>MIN_VALUE</li></ul> <p>The MIN_VALUE function returns the minimum value(lexicographically ordered) of the choosen timeseries (one or more).</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT MIN_VALUE (Path) (COMMA MIN_VALUE (Path))* FROM <FromClause> [WHERE <WhereClause>]? |
| Eg. SELECT MIN_VALUE(status),MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24 |
| Note: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>NOW</li></ul> <p>The NOW function returns the current timestamp. This function can be used in the data operation statement to represent time. The result is a signed 64-bit integer, greater than 0.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>NOW() |
| Eg. INSERT INTO root.ln.wf01.wt01(timestamp,status) VALUES(NOW(), false) |
| Eg. UPDATE root.ln.wf01.wt01 SET temperature = 23 WHERE time < NOW() |
| Eg. DELETE FROM root.ln.wf01.wt01.status, root.ln.wf01.wt01.temperature WHERE time < NOW() |
| Eg. SELECT * FROM root WHERE time < NOW() |
| Eg. SELECT COUNT(temperature) FROM root.ln.wf01.wt01 WHERE time < NOW() |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><ul><li>SUM</li></ul> <p>The SUM function returns the sum of the choosen timeseries (one or more) over a specified period of time. The timeseries must be int32, int64, float, double type, and the other types are not to be calculated. The result is a double type number.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT SUM(Path) (COMMA SUM(Path))* FROM <FromClause> [WHERE <WhereClause>]? |
| Eg. SELECT SUM(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24 |
| Note: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="ttl"><a href="#ttl" class="header-anchor">#</a> TTL</h2> <p>IoTDB supports storage-level TTL settings, which means it is able to delete old data |
| automatically and periodically. The benefit of using TTL is that hopefully you can control the |
| total disk space usage and prevent the machine from running out of disks. Moreover, the query |
| performance may downgrade as the total number of files goes up and the memory usage also increase |
| as there are more files. Timely removing such files helps to keep at a high query performance |
| level and reduce memory usage. The TTL operations in IoTDB are supported by the following three |
| statements:</p> <ul><li>Set TTL</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SET TTL TO StorageGroupName TTLTime |
| Eg. SET TTL TO root.group1 3600000 |
| This example means that for data in root.group1, only that of the latest 1 hour will remain, the |
| older one is removed or made invisible. |
| Note: TTLTime should be millisecond timestamp. When TTL is set, insertions that fall |
| out of TTL will be rejected. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><ul><li>Unset TTL</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>UNSET TTL TO StorageGroupName |
| Eg. UNSET TTL TO root.group1 |
| This example means that data of all time will be accepted in this group. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Show TTL</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW ALL TTL |
| SHOW TTL ON StorageGroupNames |
| Eg.1 SHOW ALL TTL |
| This example will show TTLs of all storage groups. |
| Eg.2 SHOW TTL ON root.group1,root.group2,root.group3 |
| This example will show TTLs of the specified 3 groups. |
| Notice: storage groups without TTL will show a "null" |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>Notice: When you set TTL to some storage groups, data out of the TTL will be made invisible |
| immediately, but because the data files may contain both out-dated and living data or the data files may |
| be being used by queries, the physical removal of data is stale. If you increase or unset TTL |
| just after setting it previously, some previously invisible data may be seen again, but the |
| physically removed one is lost forever. In other words, different from delete statement, the |
| atomicity of data deletion is not guaranteed for efficiency concerns. So we recommend that you do |
| not change the TTL once it is set or at least do not reset it frequently, unless you are determined |
| to suffer the unpredictability.</p> <h1 id="reference"><a href="#reference" class="header-anchor">#</a> Reference</h1> <h2 id="keywords"><a href="#keywords" class="header-anchor">#</a> Keywords</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code>Keywords for IoTDB (case insensitive): |
| ADD, BY, COMPRESSOR, CREATE, DATATYPE, DELETE, DESCRIBE, DROP, ENCODING, EXIT, FROM, GRANT, GROUP, LABLE, LINK, INDEX, INSERT, INTO, LOAD, MAX_POINT_NUMBER, MERGE, METADATA, ON, ORDER, PASSWORD, PRIVILEGES, PROPERTY, QUIT, REVOKE, ROLE, ROOT, SELECT, SET, SHOW, STORAGE, TIME, TIMESERIES, TIMESTAMP, TO, UNLINK, UPDATE, USER, USING, VALUE, VALUES, WHERE, WITH |
| |
| Keywords with special meanings (case insensitive): |
| * Data Types: BOOLEAN, DOUBLE, FLOAT, INT32, INT64, TEXT |
| * Encoding Methods: BITMAP, DFT, GORILLA, PLAIN, RLE, TS_2DIFF |
| * Compression Methods: UNCOMPRESSED, SNAPPY, GZIP, LZ0, ZDT, PAA, PLA |
| * Logical symbol: AND, &, &&, OR, | , ||, NOT, !, TRUE, FALSE |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><h2 id="identifiers"><a href="#identifiers" class="header-anchor">#</a> Identifiers</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code>QUOTE := '\''; |
| DOT := '.'; |
| COLON : ':' ; |
| COMMA := ',' ; |
| SEMICOLON := ';' ; |
| LPAREN := '(' ; |
| RPAREN := ')' ; |
| LBRACKET := '['; |
| RBRACKET := ']'; |
| EQUAL := '=' | '=='; |
| NOTEQUAL := '<>' | '!='; |
| LESSTHANOREQUALTO := '<='; |
| LESSTHAN := '<'; |
| GREATERTHANOREQUALTO := '>='; |
| GREATERTHAN := '>'; |
| DIVIDE := '/'; |
| PLUS := '+'; |
| MINUS := '-'; |
| STAR := '*'; |
| Letter := 'a'..'z' | 'A'..'Z'; |
| HexDigit := 'a'..'f' | 'A'..'F'; |
| Digit := '0'..'9'; |
| Boolean := TRUE | FALSE | 0 | 1 (case insensitive) |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>StringLiteral := ( '\'' ( ~('\'') )* '\'' | '\"' ( ~('\"') )* '\"'); |
| eg. 'abc' |
| eg. 'abc' |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>Integer := ('-' | '+')? Digit+; |
| eg. 123 |
| eg. -222 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>Float := ('-' | '+')? Digit+ DOT Digit+ (('e' | 'E') ('-' | '+')? Digit+)?; |
| eg. 3.1415 |
| eg. 1.2E10 |
| eg. -1.33 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>Identifier := (Letter | '_') (Letter | Digit | '_' | MINUS)*; |
| eg. a123 |
| eg. _abc123 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="literals"><a href="#literals" class="header-anchor">#</a> Literals</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code>PointValue : Integer | Float | StringLiteral | Boolean |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>TimeValue : Integer | DateTime | ISO8601 | NOW() |
| Note: Integer means timestamp type. |
| |
| DateTime : |
| eg. 2016-11-16T16:22:33+08:00 |
| eg. 2016-11-16 16:22:33+08:00 |
| eg. 2016-11-16T16:22:33.000+08:00 |
| eg. 2016-11-16 16:22:33.000+08:00 |
| Note: DateTime Type can support several types, see Chapter 3 Datetime section for details. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>PrecedenceEqualOperator : EQUAL | NOTEQUAL | LESSTHANOREQUALTO | LESSTHAN | GREATERTHANOREQUALTO | GREATERTHAN |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>Timeseries : ROOT [DOT <LayerName>]* DOT <SensorName> |
| LayerName : Identifier |
| SensorName : Identifier |
| eg. root.ln.wf01.wt01.status |
| eg. root.sgcc.wf03.wt01.temperature |
| Note: Timeseries must be start with `root`(case insensitive) and end with sensor name. |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>PrefixPath : ROOT (DOT <LayerName>)* |
| LayerName : Identifier | STAR |
| eg. root.sgcc |
| eg. root.* |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>Path: (ROOT | <LayerName>) (DOT <LayerName>)* |
| LayerName: Identifier | STAR |
| eg. root.ln.wf01.wt01.status |
| eg. root.*.wf01.wt01.status |
| eg. root.ln.wf01.wt01.* |
| eg. *.wt01.* |
| eg. * |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev"> |
| ← |
| <a href="/UserGuide/V0.9.x/5-Operation Manual/3-Account Management Statements.html" class="prev"> |
| Account Management Statements |
| </a></span> <span class="next"><a href="/UserGuide/V0.9.x/6-System Tools/1-Sync Tool.html"> |
| Sync Tool |
| </a> |
| → |
| </span></p></div> <p style="text-align: center;">Copyright © 2021 The Apache Software Foundation.<br> |
| Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p> <p style="text-align: center; margin-top: 10px; color: #444"> |
| Contact us: Join QQ Group 659990460 | Add friend <i>tietouqiao</i> and be invited to Wechat Group<br> |
| see <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> for more</p></main></div><div class="global-ui"></div></div> |
| <script src="/assets/js/app.c078fe6d.js" defer></script><script src="/assets/js/3.5626571b.js" defer></script><script src="/assets/js/254.03023b0c.js" defer></script> |
| </body> |
| </html> |