| <!DOCTYPE html> |
| <html lang="zh-CN"> |
| <head> |
| <meta charset="utf-8"> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <title> </title> |
| <meta name="generator" content="VuePress 1.8.0"> |
| <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.679f71b6.css" as="style"><link rel="preload" href="/assets/js/app.9d485032.js" as="script"><link rel="preload" href="/assets/js/3.80bccc99.js" as="script"><link rel="preload" href="/assets/js/389.f449e4ea.js" as="script"><link rel="prefetch" href="/assets/js/10.80a35593.js"><link rel="prefetch" href="/assets/js/100.29307610.js"><link rel="prefetch" href="/assets/js/101.907577b4.js"><link rel="prefetch" href="/assets/js/102.37515932.js"><link rel="prefetch" href="/assets/js/103.011a72fd.js"><link rel="prefetch" href="/assets/js/104.28c671f4.js"><link rel="prefetch" href="/assets/js/105.3e6917b2.js"><link rel="prefetch" href="/assets/js/106.e1245bb9.js"><link rel="prefetch" href="/assets/js/107.6ba60b87.js"><link rel="prefetch" href="/assets/js/108.ee0de252.js"><link rel="prefetch" href="/assets/js/109.ff015e04.js"><link rel="prefetch" href="/assets/js/11.d8e8f747.js"><link rel="prefetch" href="/assets/js/110.7c2bd3a4.js"><link rel="prefetch" href="/assets/js/111.2ac401e3.js"><link rel="prefetch" href="/assets/js/112.d3d33936.js"><link rel="prefetch" href="/assets/js/113.d20e71c4.js"><link rel="prefetch" href="/assets/js/114.b18c6e29.js"><link rel="prefetch" href="/assets/js/115.7939b45e.js"><link rel="prefetch" href="/assets/js/116.058a2437.js"><link rel="prefetch" href="/assets/js/117.e17270a6.js"><link rel="prefetch" href="/assets/js/118.cc7d4332.js"><link rel="prefetch" href="/assets/js/119.33d80c81.js"><link rel="prefetch" href="/assets/js/12.4b70257a.js"><link rel="prefetch" href="/assets/js/120.4136bcc6.js"><link rel="prefetch" href="/assets/js/121.af83b6b7.js"><link rel="prefetch" href="/assets/js/122.fdac225a.js"><link rel="prefetch" href="/assets/js/123.fc6c2d13.js"><link rel="prefetch" href="/assets/js/124.819dfa96.js"><link rel="prefetch" href="/assets/js/125.97c99f90.js"><link rel="prefetch" href="/assets/js/126.1e45da0e.js"><link rel="prefetch" href="/assets/js/127.393a9d4f.js"><link rel="prefetch" href="/assets/js/128.509f58cf.js"><link rel="prefetch" href="/assets/js/129.ed9d72ca.js"><link rel="prefetch" href="/assets/js/13.045c8a67.js"><link rel="prefetch" href="/assets/js/130.0d59d268.js"><link rel="prefetch" href="/assets/js/131.c079c686.js"><link rel="prefetch" href="/assets/js/132.8084a387.js"><link rel="prefetch" href="/assets/js/133.e1bb8511.js"><link rel="prefetch" href="/assets/js/134.dee2e5b7.js"><link rel="prefetch" href="/assets/js/135.27b43e5b.js"><link rel="prefetch" href="/assets/js/136.7265a771.js"><link rel="prefetch" href="/assets/js/137.e02bf420.js"><link rel="prefetch" href="/assets/js/138.5fc03115.js"><link rel="prefetch" href="/assets/js/139.e19f19fe.js"><link rel="prefetch" href="/assets/js/14.64616df0.js"><link rel="prefetch" href="/assets/js/140.4b841561.js"><link rel="prefetch" href="/assets/js/141.8af4bc46.js"><link rel="prefetch" href="/assets/js/142.75dca561.js"><link rel="prefetch" href="/assets/js/143.860a29ab.js"><link rel="prefetch" href="/assets/js/144.9232bb52.js"><link rel="prefetch" href="/assets/js/145.f250b186.js"><link rel="prefetch" href="/assets/js/146.482c7c3c.js"><link rel="prefetch" href="/assets/js/147.eb3d5b95.js"><link rel="prefetch" href="/assets/js/148.b006a63b.js"><link rel="prefetch" href="/assets/js/149.123490f8.js"><link rel="prefetch" href="/assets/js/15.dbbb965d.js"><link rel="prefetch" href="/assets/js/150.fa33e60d.js"><link rel="prefetch" href="/assets/js/151.60dd9d1d.js"><link rel="prefetch" href="/assets/js/152.418c5188.js"><link rel="prefetch" href="/assets/js/153.ad19a757.js"><link rel="prefetch" href="/assets/js/154.e303837e.js"><link rel="prefetch" href="/assets/js/155.36b53298.js"><link rel="prefetch" href="/assets/js/156.1fcc2b06.js"><link rel="prefetch" href="/assets/js/157.c8b11122.js"><link rel="prefetch" href="/assets/js/158.ed254575.js"><link rel="prefetch" href="/assets/js/159.4ebfe922.js"><link rel="prefetch" href="/assets/js/16.f39185fe.js"><link rel="prefetch" href="/assets/js/160.fda14cb4.js"><link rel="prefetch" href="/assets/js/161.2ec0c797.js"><link rel="prefetch" href="/assets/js/162.31647ddf.js"><link rel="prefetch" href="/assets/js/163.6c460d63.js"><link rel="prefetch" href="/assets/js/164.676b024a.js"><link rel="prefetch" href="/assets/js/165.7c11f379.js"><link rel="prefetch" href="/assets/js/166.e455a0d6.js"><link rel="prefetch" href="/assets/js/167.2789bddc.js"><link rel="prefetch" href="/assets/js/168.64787dbc.js"><link rel="prefetch" href="/assets/js/169.0bd9deb0.js"><link rel="prefetch" href="/assets/js/17.98d20099.js"><link rel="prefetch" href="/assets/js/170.414b10d4.js"><link rel="prefetch" href="/assets/js/171.b04c2097.js"><link rel="prefetch" href="/assets/js/172.2c2728a4.js"><link rel="prefetch" href="/assets/js/173.7b3813ef.js"><link rel="prefetch" href="/assets/js/174.e6e9e0c2.js"><link rel="prefetch" href="/assets/js/175.4117bbca.js"><link rel="prefetch" href="/assets/js/176.e3cec383.js"><link rel="prefetch" href="/assets/js/177.1cb7059a.js"><link rel="prefetch" href="/assets/js/178.5e05b9a3.js"><link rel="prefetch" href="/assets/js/179.2731f2c3.js"><link rel="prefetch" href="/assets/js/18.01dc2c1a.js"><link rel="prefetch" href="/assets/js/180.8d42ab94.js"><link rel="prefetch" href="/assets/js/181.730d7657.js"><link rel="prefetch" href="/assets/js/182.23c62aee.js"><link rel="prefetch" href="/assets/js/183.ea978fdc.js"><link rel="prefetch" href="/assets/js/184.62f40035.js"><link rel="prefetch" href="/assets/js/185.2fa278d4.js"><link rel="prefetch" href="/assets/js/186.e1983553.js"><link rel="prefetch" href="/assets/js/187.bd5f8aae.js"><link rel="prefetch" href="/assets/js/188.fde94bc7.js"><link rel="prefetch" href="/assets/js/189.80235505.js"><link rel="prefetch" href="/assets/js/19.32f5cb38.js"><link rel="prefetch" href="/assets/js/190.48851103.js"><link rel="prefetch" href="/assets/js/191.fce0fe30.js"><link rel="prefetch" href="/assets/js/192.268a49ec.js"><link rel="prefetch" href="/assets/js/193.38f39029.js"><link rel="prefetch" href="/assets/js/194.0fa9b75a.js"><link rel="prefetch" href="/assets/js/195.187b3b6f.js"><link rel="prefetch" href="/assets/js/196.e9d07006.js"><link rel="prefetch" href="/assets/js/197.35de15e6.js"><link rel="prefetch" href="/assets/js/198.f90bfa30.js"><link rel="prefetch" href="/assets/js/199.26d62d4b.js"><link rel="prefetch" href="/assets/js/20.b098f0f5.js"><link rel="prefetch" href="/assets/js/200.8687a88a.js"><link rel="prefetch" href="/assets/js/201.fe9116ec.js"><link rel="prefetch" href="/assets/js/202.49a57957.js"><link rel="prefetch" href="/assets/js/203.d505eb7e.js"><link rel="prefetch" href="/assets/js/204.b38bac14.js"><link rel="prefetch" href="/assets/js/205.e63ffcd2.js"><link rel="prefetch" href="/assets/js/206.e36c8ffc.js"><link rel="prefetch" href="/assets/js/207.1026000d.js"><link rel="prefetch" href="/assets/js/208.15f562db.js"><link rel="prefetch" href="/assets/js/209.5757e1d4.js"><link rel="prefetch" href="/assets/js/21.5b501017.js"><link rel="prefetch" href="/assets/js/210.bafb594c.js"><link rel="prefetch" href="/assets/js/211.36d81187.js"><link rel="prefetch" href="/assets/js/212.621c7cff.js"><link rel="prefetch" href="/assets/js/213.ddd65089.js"><link rel="prefetch" href="/assets/js/214.9b2a7c16.js"><link rel="prefetch" href="/assets/js/215.7cbb5cb1.js"><link rel="prefetch" href="/assets/js/216.72090d93.js"><link rel="prefetch" href="/assets/js/217.fa5676c4.js"><link rel="prefetch" href="/assets/js/218.3bfd3358.js"><link rel="prefetch" href="/assets/js/219.4365ec9c.js"><link rel="prefetch" href="/assets/js/22.b7f6fef5.js"><link rel="prefetch" href="/assets/js/220.8618b36c.js"><link rel="prefetch" href="/assets/js/221.1f025987.js"><link rel="prefetch" href="/assets/js/222.dd9493f5.js"><link rel="prefetch" href="/assets/js/223.f488af59.js"><link rel="prefetch" href="/assets/js/224.9c3d963d.js"><link rel="prefetch" href="/assets/js/225.9f1309f1.js"><link rel="prefetch" href="/assets/js/226.06e9112f.js"><link rel="prefetch" href="/assets/js/227.ac375105.js"><link rel="prefetch" href="/assets/js/228.b5de121e.js"><link rel="prefetch" href="/assets/js/229.eacac93e.js"><link rel="prefetch" href="/assets/js/23.5e85a335.js"><link rel="prefetch" href="/assets/js/230.ba26d1ad.js"><link rel="prefetch" href="/assets/js/231.1d4a92f2.js"><link rel="prefetch" href="/assets/js/232.8a053837.js"><link rel="prefetch" href="/assets/js/233.461f3d80.js"><link rel="prefetch" href="/assets/js/234.cc97548a.js"><link rel="prefetch" href="/assets/js/235.d5c8825f.js"><link rel="prefetch" href="/assets/js/236.64f83641.js"><link rel="prefetch" href="/assets/js/237.727baf70.js"><link rel="prefetch" href="/assets/js/238.97194e86.js"><link rel="prefetch" href="/assets/js/239.e2214f9c.js"><link rel="prefetch" href="/assets/js/24.e0e8d4fd.js"><link rel="prefetch" href="/assets/js/240.d556e0f7.js"><link rel="prefetch" href="/assets/js/241.5b24ee77.js"><link rel="prefetch" href="/assets/js/242.e7dea18a.js"><link rel="prefetch" href="/assets/js/243.7afc0027.js"><link rel="prefetch" href="/assets/js/244.aaba03d8.js"><link rel="prefetch" href="/assets/js/245.12c762b6.js"><link rel="prefetch" href="/assets/js/246.665a9f7c.js"><link rel="prefetch" href="/assets/js/247.7c01c9a0.js"><link rel="prefetch" href="/assets/js/248.9691ca51.js"><link rel="prefetch" href="/assets/js/249.54231cf2.js"><link rel="prefetch" href="/assets/js/25.0eac08dd.js"><link rel="prefetch" href="/assets/js/250.c04d5b3e.js"><link rel="prefetch" href="/assets/js/251.e3192e36.js"><link rel="prefetch" href="/assets/js/252.7af848b7.js"><link rel="prefetch" href="/assets/js/253.07764dda.js"><link rel="prefetch" href="/assets/js/254.fb652588.js"><link rel="prefetch" href="/assets/js/255.3a167a84.js"><link rel="prefetch" href="/assets/js/256.4d4484c4.js"><link rel="prefetch" href="/assets/js/257.b8171800.js"><link rel="prefetch" href="/assets/js/258.66de1268.js"><link rel="prefetch" href="/assets/js/259.78d76c0a.js"><link rel="prefetch" href="/assets/js/26.c9867be1.js"><link rel="prefetch" href="/assets/js/260.099b3638.js"><link rel="prefetch" href="/assets/js/261.bb8c6f44.js"><link rel="prefetch" href="/assets/js/262.9cc58c1d.js"><link rel="prefetch" href="/assets/js/263.d8c4f0f1.js"><link rel="prefetch" href="/assets/js/264.0bb5e491.js"><link rel="prefetch" href="/assets/js/265.c28d73bc.js"><link rel="prefetch" href="/assets/js/266.51c31c58.js"><link rel="prefetch" href="/assets/js/267.793aab09.js"><link rel="prefetch" href="/assets/js/268.579cc048.js"><link rel="prefetch" href="/assets/js/269.954199ce.js"><link rel="prefetch" href="/assets/js/27.d41edf86.js"><link rel="prefetch" href="/assets/js/270.afc9ef86.js"><link rel="prefetch" href="/assets/js/271.9e49eaab.js"><link rel="prefetch" href="/assets/js/272.14e37178.js"><link rel="prefetch" href="/assets/js/273.8bdd74b9.js"><link rel="prefetch" href="/assets/js/274.8bb98f41.js"><link rel="prefetch" href="/assets/js/275.fbabaf72.js"><link rel="prefetch" href="/assets/js/276.37b24cad.js"><link rel="prefetch" href="/assets/js/277.4ac7e73c.js"><link rel="prefetch" href="/assets/js/278.d07bf8b4.js"><link rel="prefetch" href="/assets/js/279.96e054cc.js"><link rel="prefetch" href="/assets/js/28.d036ec63.js"><link rel="prefetch" href="/assets/js/280.9fa37cf8.js"><link rel="prefetch" href="/assets/js/281.c81edb40.js"><link rel="prefetch" href="/assets/js/282.c75baace.js"><link rel="prefetch" href="/assets/js/283.a6a1fe28.js"><link rel="prefetch" href="/assets/js/284.b782760d.js"><link rel="prefetch" href="/assets/js/285.335ca82b.js"><link rel="prefetch" href="/assets/js/286.d993326a.js"><link rel="prefetch" href="/assets/js/287.053238aa.js"><link rel="prefetch" href="/assets/js/288.07fa0b59.js"><link rel="prefetch" href="/assets/js/289.6704b174.js"><link rel="prefetch" href="/assets/js/29.069cf689.js"><link rel="prefetch" href="/assets/js/290.d7414dff.js"><link rel="prefetch" href="/assets/js/291.7d6cb2ea.js"><link rel="prefetch" href="/assets/js/292.35ccdf37.js"><link rel="prefetch" href="/assets/js/293.af7157ef.js"><link rel="prefetch" href="/assets/js/294.6bb48ba8.js"><link rel="prefetch" href="/assets/js/295.097b59c4.js"><link rel="prefetch" href="/assets/js/296.4fca5cca.js"><link rel="prefetch" href="/assets/js/297.5bfd0ef9.js"><link rel="prefetch" href="/assets/js/298.52665684.js"><link rel="prefetch" href="/assets/js/299.86b568f3.js"><link rel="prefetch" href="/assets/js/30.d9ae5fd3.js"><link rel="prefetch" href="/assets/js/300.4425ae8c.js"><link rel="prefetch" href="/assets/js/301.7c341f63.js"><link rel="prefetch" href="/assets/js/302.cccc05d8.js"><link rel="prefetch" href="/assets/js/303.e33447dd.js"><link rel="prefetch" href="/assets/js/304.4c739580.js"><link rel="prefetch" href="/assets/js/305.aa067d8b.js"><link rel="prefetch" href="/assets/js/306.eee8d8e1.js"><link rel="prefetch" href="/assets/js/307.520ab5d8.js"><link rel="prefetch" href="/assets/js/308.42f8217f.js"><link rel="prefetch" href="/assets/js/309.571889c2.js"><link rel="prefetch" href="/assets/js/31.d5b2b275.js"><link rel="prefetch" href="/assets/js/310.37c09e50.js"><link rel="prefetch" href="/assets/js/311.06cc4ee5.js"><link rel="prefetch" href="/assets/js/312.dade5716.js"><link rel="prefetch" href="/assets/js/313.a91c4d88.js"><link rel="prefetch" href="/assets/js/314.b29ef147.js"><link rel="prefetch" href="/assets/js/315.651d6b8c.js"><link rel="prefetch" href="/assets/js/316.64f9b0c8.js"><link rel="prefetch" href="/assets/js/317.ae1b5904.js"><link rel="prefetch" href="/assets/js/318.9a2f2492.js"><link rel="prefetch" href="/assets/js/319.fbc58603.js"><link rel="prefetch" href="/assets/js/32.da754300.js"><link rel="prefetch" href="/assets/js/320.e9f2a31b.js"><link rel="prefetch" href="/assets/js/321.e68fbabd.js"><link rel="prefetch" href="/assets/js/322.b72c6d25.js"><link rel="prefetch" href="/assets/js/323.d665fbcc.js"><link rel="prefetch" href="/assets/js/324.5e52bb59.js"><link rel="prefetch" href="/assets/js/325.b245f89e.js"><link rel="prefetch" href="/assets/js/326.4cc5e1c8.js"><link rel="prefetch" href="/assets/js/327.533646ac.js"><link rel="prefetch" href="/assets/js/328.f8fb15c5.js"><link rel="prefetch" href="/assets/js/329.05958bb4.js"><link rel="prefetch" href="/assets/js/33.15359fa6.js"><link rel="prefetch" href="/assets/js/330.18e9e5ba.js"><link rel="prefetch" href="/assets/js/331.b7a7934e.js"><link rel="prefetch" href="/assets/js/332.d02fbc7d.js"><link rel="prefetch" href="/assets/js/333.4d99fd0a.js"><link rel="prefetch" href="/assets/js/334.a945711e.js"><link rel="prefetch" href="/assets/js/335.364e1c87.js"><link rel="prefetch" href="/assets/js/336.75f32bdd.js"><link rel="prefetch" href="/assets/js/337.65b9e202.js"><link rel="prefetch" href="/assets/js/338.4e3e0237.js"><link rel="prefetch" href="/assets/js/339.b3b87712.js"><link rel="prefetch" href="/assets/js/34.d28e52b8.js"><link rel="prefetch" href="/assets/js/340.d9ae10fe.js"><link rel="prefetch" href="/assets/js/341.539b0c9b.js"><link rel="prefetch" href="/assets/js/342.a3989060.js"><link rel="prefetch" href="/assets/js/343.960b7508.js"><link rel="prefetch" href="/assets/js/344.6d8cdfe7.js"><link rel="prefetch" href="/assets/js/345.e7e86142.js"><link rel="prefetch" href="/assets/js/346.a6ed89b5.js"><link rel="prefetch" href="/assets/js/347.e490cb19.js"><link rel="prefetch" href="/assets/js/348.dff0ad35.js"><link rel="prefetch" href="/assets/js/349.4bcc0163.js"><link rel="prefetch" href="/assets/js/35.448cb413.js"><link rel="prefetch" href="/assets/js/350.084e0aa3.js"><link rel="prefetch" href="/assets/js/351.fbf634a8.js"><link rel="prefetch" href="/assets/js/352.44017e86.js"><link rel="prefetch" href="/assets/js/353.1b6e7af9.js"><link rel="prefetch" href="/assets/js/354.e14d3894.js"><link rel="prefetch" href="/assets/js/355.b2a15211.js"><link rel="prefetch" href="/assets/js/356.322f548a.js"><link rel="prefetch" href="/assets/js/357.c844f660.js"><link rel="prefetch" href="/assets/js/358.d969cfe2.js"><link rel="prefetch" href="/assets/js/359.aa6ff474.js"><link rel="prefetch" href="/assets/js/36.2550923b.js"><link rel="prefetch" href="/assets/js/360.97401cea.js"><link rel="prefetch" href="/assets/js/361.04034832.js"><link rel="prefetch" href="/assets/js/362.64fa2dd8.js"><link rel="prefetch" href="/assets/js/363.fca50e3b.js"><link rel="prefetch" href="/assets/js/364.4a2129c5.js"><link rel="prefetch" href="/assets/js/365.143f10fc.js"><link rel="prefetch" href="/assets/js/366.255af148.js"><link rel="prefetch" href="/assets/js/367.aed5a6de.js"><link rel="prefetch" href="/assets/js/368.b1c7f369.js"><link rel="prefetch" href="/assets/js/369.b6761e08.js"><link rel="prefetch" href="/assets/js/37.6741f71b.js"><link rel="prefetch" href="/assets/js/370.c725380c.js"><link rel="prefetch" href="/assets/js/371.ac5ae791.js"><link rel="prefetch" href="/assets/js/372.e7fd06c9.js"><link rel="prefetch" href="/assets/js/373.d059a669.js"><link rel="prefetch" href="/assets/js/374.fdaa8d4a.js"><link rel="prefetch" href="/assets/js/375.797a45dd.js"><link rel="prefetch" href="/assets/js/376.795ff584.js"><link rel="prefetch" href="/assets/js/377.dec17054.js"><link rel="prefetch" href="/assets/js/378.328acce3.js"><link rel="prefetch" href="/assets/js/379.0a988cdc.js"><link rel="prefetch" href="/assets/js/38.872948ca.js"><link rel="prefetch" href="/assets/js/380.a0a7a73b.js"><link rel="prefetch" href="/assets/js/381.4be43bef.js"><link rel="prefetch" href="/assets/js/382.63daddd6.js"><link rel="prefetch" href="/assets/js/383.61b6736e.js"><link rel="prefetch" href="/assets/js/384.d0e7b164.js"><link rel="prefetch" href="/assets/js/385.3f458819.js"><link rel="prefetch" href="/assets/js/386.b60a678c.js"><link rel="prefetch" href="/assets/js/387.840c605f.js"><link rel="prefetch" href="/assets/js/388.4b73aac0.js"><link rel="prefetch" href="/assets/js/39.9bd02c85.js"><link rel="prefetch" href="/assets/js/390.17e398a8.js"><link rel="prefetch" href="/assets/js/391.5d779558.js"><link rel="prefetch" href="/assets/js/392.eee533f7.js"><link rel="prefetch" href="/assets/js/393.97737dd9.js"><link rel="prefetch" href="/assets/js/394.13aa92f6.js"><link rel="prefetch" href="/assets/js/395.4f45e960.js"><link rel="prefetch" href="/assets/js/396.808e0cd2.js"><link rel="prefetch" href="/assets/js/397.fb7f6d60.js"><link rel="prefetch" href="/assets/js/398.b46bdc7c.js"><link rel="prefetch" href="/assets/js/399.664d6571.js"><link rel="prefetch" href="/assets/js/4.99e5432f.js"><link rel="prefetch" href="/assets/js/40.aba15496.js"><link rel="prefetch" href="/assets/js/400.ee648749.js"><link rel="prefetch" href="/assets/js/401.1d9f4e1d.js"><link rel="prefetch" href="/assets/js/402.2d1d459a.js"><link rel="prefetch" href="/assets/js/403.0461a1a2.js"><link rel="prefetch" href="/assets/js/404.de8afb41.js"><link rel="prefetch" href="/assets/js/405.95989daa.js"><link rel="prefetch" href="/assets/js/406.2668e050.js"><link rel="prefetch" href="/assets/js/407.16c4942b.js"><link rel="prefetch" href="/assets/js/408.51522d4c.js"><link rel="prefetch" href="/assets/js/409.a2313195.js"><link rel="prefetch" href="/assets/js/41.e9874039.js"><link rel="prefetch" href="/assets/js/410.ca2fb3cc.js"><link rel="prefetch" href="/assets/js/411.cdca05e7.js"><link rel="prefetch" href="/assets/js/412.9616da28.js"><link rel="prefetch" href="/assets/js/413.bea54b36.js"><link rel="prefetch" href="/assets/js/414.c1bf84b3.js"><link rel="prefetch" href="/assets/js/415.345fd8d2.js"><link rel="prefetch" href="/assets/js/416.53c3dae7.js"><link rel="prefetch" href="/assets/js/417.e61fc1a4.js"><link rel="prefetch" href="/assets/js/418.7de45153.js"><link rel="prefetch" href="/assets/js/419.ceaaf5bc.js"><link rel="prefetch" href="/assets/js/42.9a545fc9.js"><link rel="prefetch" href="/assets/js/420.203347ef.js"><link rel="prefetch" href="/assets/js/421.c8883568.js"><link rel="prefetch" href="/assets/js/422.76ccb9f0.js"><link rel="prefetch" href="/assets/js/423.9db4679d.js"><link rel="prefetch" href="/assets/js/424.783b9c44.js"><link rel="prefetch" href="/assets/js/425.6a70e6e0.js"><link rel="prefetch" href="/assets/js/426.ec3e85c0.js"><link rel="prefetch" href="/assets/js/427.56a19e65.js"><link rel="prefetch" href="/assets/js/428.0178afc3.js"><link rel="prefetch" href="/assets/js/429.76cfa225.js"><link rel="prefetch" href="/assets/js/43.40991519.js"><link rel="prefetch" href="/assets/js/430.47686810.js"><link rel="prefetch" href="/assets/js/431.5a662523.js"><link rel="prefetch" href="/assets/js/432.5a532c26.js"><link rel="prefetch" href="/assets/js/433.4265c0c8.js"><link rel="prefetch" href="/assets/js/434.38b5a2f2.js"><link rel="prefetch" href="/assets/js/435.87dac4c6.js"><link rel="prefetch" href="/assets/js/436.493a7dab.js"><link rel="prefetch" href="/assets/js/437.e03b1388.js"><link rel="prefetch" href="/assets/js/438.719d3f41.js"><link rel="prefetch" href="/assets/js/439.ee41f52f.js"><link rel="prefetch" href="/assets/js/44.42a59cfd.js"><link rel="prefetch" href="/assets/js/440.29e69e6b.js"><link rel="prefetch" href="/assets/js/441.cae3ced6.js"><link rel="prefetch" href="/assets/js/442.74d38195.js"><link rel="prefetch" href="/assets/js/443.304263cb.js"><link rel="prefetch" href="/assets/js/444.9ce26026.js"><link rel="prefetch" href="/assets/js/445.85c966a7.js"><link rel="prefetch" href="/assets/js/446.f9bb500c.js"><link rel="prefetch" href="/assets/js/447.c442384b.js"><link rel="prefetch" href="/assets/js/448.aeb59378.js"><link rel="prefetch" href="/assets/js/449.1cf773be.js"><link rel="prefetch" href="/assets/js/45.61a4c404.js"><link rel="prefetch" href="/assets/js/450.2b2b3763.js"><link rel="prefetch" href="/assets/js/451.fe1519c3.js"><link rel="prefetch" href="/assets/js/452.48899981.js"><link rel="prefetch" href="/assets/js/453.7ae7e168.js"><link rel="prefetch" href="/assets/js/454.55aa5196.js"><link rel="prefetch" href="/assets/js/455.5e5f9203.js"><link rel="prefetch" href="/assets/js/456.7e355aeb.js"><link rel="prefetch" href="/assets/js/457.1daeb67d.js"><link rel="prefetch" href="/assets/js/458.fab9dd1e.js"><link rel="prefetch" href="/assets/js/459.71f9f5be.js"><link rel="prefetch" href="/assets/js/46.733d682a.js"><link rel="prefetch" href="/assets/js/460.b55ad6c6.js"><link rel="prefetch" href="/assets/js/461.314203cd.js"><link rel="prefetch" href="/assets/js/462.29a59885.js"><link rel="prefetch" href="/assets/js/463.3b643f83.js"><link rel="prefetch" href="/assets/js/464.239479b6.js"><link rel="prefetch" href="/assets/js/465.c238e08f.js"><link rel="prefetch" href="/assets/js/466.a6612120.js"><link rel="prefetch" href="/assets/js/467.833308dd.js"><link rel="prefetch" href="/assets/js/468.6d5fe511.js"><link rel="prefetch" href="/assets/js/469.865ee4db.js"><link rel="prefetch" href="/assets/js/47.dbbe958b.js"><link rel="prefetch" href="/assets/js/470.2a938456.js"><link rel="prefetch" href="/assets/js/471.92367d00.js"><link rel="prefetch" href="/assets/js/472.5f71339d.js"><link rel="prefetch" href="/assets/js/473.5293f816.js"><link rel="prefetch" href="/assets/js/474.479af909.js"><link rel="prefetch" href="/assets/js/475.735dc127.js"><link rel="prefetch" href="/assets/js/476.fcd47b06.js"><link rel="prefetch" href="/assets/js/477.1440bf29.js"><link rel="prefetch" href="/assets/js/478.9ffd59ed.js"><link rel="prefetch" href="/assets/js/479.2084922c.js"><link rel="prefetch" href="/assets/js/48.c713e3be.js"><link rel="prefetch" href="/assets/js/480.89dc22ce.js"><link rel="prefetch" href="/assets/js/481.567e307e.js"><link rel="prefetch" href="/assets/js/482.fc2823de.js"><link rel="prefetch" href="/assets/js/483.b9fbcc3d.js"><link rel="prefetch" href="/assets/js/484.b62bd3a3.js"><link rel="prefetch" href="/assets/js/485.e6e32e45.js"><link rel="prefetch" href="/assets/js/486.ff58b4b3.js"><link rel="prefetch" href="/assets/js/487.21f0f423.js"><link rel="prefetch" href="/assets/js/488.8a8dd70c.js"><link rel="prefetch" href="/assets/js/489.dd637673.js"><link rel="prefetch" href="/assets/js/49.619260a9.js"><link rel="prefetch" href="/assets/js/490.6e883e15.js"><link rel="prefetch" href="/assets/js/491.29e931a1.js"><link rel="prefetch" href="/assets/js/492.47a144dd.js"><link rel="prefetch" href="/assets/js/493.fecc7724.js"><link rel="prefetch" href="/assets/js/494.abdd341d.js"><link rel="prefetch" href="/assets/js/495.c94166e3.js"><link rel="prefetch" href="/assets/js/496.356823c3.js"><link rel="prefetch" href="/assets/js/497.236aa745.js"><link rel="prefetch" href="/assets/js/498.6abf781c.js"><link rel="prefetch" href="/assets/js/499.8e75257d.js"><link rel="prefetch" href="/assets/js/5.2c66b9cb.js"><link rel="prefetch" href="/assets/js/50.9706c3bd.js"><link rel="prefetch" href="/assets/js/500.e7ab6c5f.js"><link rel="prefetch" href="/assets/js/501.f39ed48f.js"><link rel="prefetch" href="/assets/js/502.b87c0be3.js"><link rel="prefetch" href="/assets/js/503.1217f5fd.js"><link rel="prefetch" href="/assets/js/504.6dc417a5.js"><link rel="prefetch" href="/assets/js/505.e7e67852.js"><link rel="prefetch" href="/assets/js/506.e78476c7.js"><link rel="prefetch" href="/assets/js/507.5c6beca4.js"><link rel="prefetch" href="/assets/js/508.5d53c32f.js"><link rel="prefetch" href="/assets/js/509.38049f9a.js"><link rel="prefetch" href="/assets/js/51.a88a8be6.js"><link rel="prefetch" href="/assets/js/510.d53ce4a2.js"><link rel="prefetch" href="/assets/js/511.c904f861.js"><link rel="prefetch" href="/assets/js/512.d74c395c.js"><link rel="prefetch" href="/assets/js/513.fdf09d6f.js"><link rel="prefetch" href="/assets/js/514.71fd2871.js"><link rel="prefetch" href="/assets/js/515.4f1b6959.js"><link rel="prefetch" href="/assets/js/516.d9d227cd.js"><link rel="prefetch" href="/assets/js/517.5db347c6.js"><link rel="prefetch" href="/assets/js/518.de9e7d5e.js"><link rel="prefetch" href="/assets/js/519.3ef0cdde.js"><link rel="prefetch" href="/assets/js/52.daf7f249.js"><link rel="prefetch" href="/assets/js/520.b2fe1484.js"><link rel="prefetch" href="/assets/js/521.42e2bea2.js"><link rel="prefetch" href="/assets/js/522.7cc301f1.js"><link rel="prefetch" href="/assets/js/523.c7da0090.js"><link rel="prefetch" href="/assets/js/524.8f770bb8.js"><link rel="prefetch" href="/assets/js/525.22aa0d44.js"><link rel="prefetch" href="/assets/js/53.6d9f67be.js"><link rel="prefetch" href="/assets/js/54.8403ce3a.js"><link rel="prefetch" href="/assets/js/55.2cd45a63.js"><link rel="prefetch" href="/assets/js/56.063dbe0f.js"><link rel="prefetch" href="/assets/js/57.24c6c793.js"><link rel="prefetch" href="/assets/js/58.ccd2f933.js"><link rel="prefetch" href="/assets/js/59.acdc23b8.js"><link rel="prefetch" href="/assets/js/6.db8c6d5d.js"><link rel="prefetch" href="/assets/js/60.0a016353.js"><link rel="prefetch" href="/assets/js/61.32b5d473.js"><link rel="prefetch" href="/assets/js/62.1d584c66.js"><link rel="prefetch" href="/assets/js/63.7104bfe2.js"><link rel="prefetch" href="/assets/js/64.cd19837f.js"><link rel="prefetch" href="/assets/js/65.28e5bacf.js"><link rel="prefetch" href="/assets/js/66.0557eb73.js"><link rel="prefetch" href="/assets/js/67.5bcade93.js"><link rel="prefetch" href="/assets/js/68.662ebf9b.js"><link rel="prefetch" href="/assets/js/69.87c036f8.js"><link rel="prefetch" href="/assets/js/7.c4a32f95.js"><link rel="prefetch" href="/assets/js/70.8b6ec4d3.js"><link rel="prefetch" href="/assets/js/71.5877c30b.js"><link rel="prefetch" href="/assets/js/72.2da225ed.js"><link rel="prefetch" href="/assets/js/73.c501e2be.js"><link rel="prefetch" href="/assets/js/74.bad05dfa.js"><link rel="prefetch" href="/assets/js/75.7bf1947b.js"><link rel="prefetch" href="/assets/js/76.e3d9c26d.js"><link rel="prefetch" href="/assets/js/77.618b7404.js"><link rel="prefetch" href="/assets/js/78.1784e838.js"><link rel="prefetch" href="/assets/js/79.de112962.js"><link rel="prefetch" href="/assets/js/8.0d7c7c38.js"><link rel="prefetch" href="/assets/js/80.ee29131c.js"><link rel="prefetch" href="/assets/js/81.ff75cbfb.js"><link rel="prefetch" href="/assets/js/82.a1a40237.js"><link rel="prefetch" href="/assets/js/83.254e58ba.js"><link rel="prefetch" href="/assets/js/84.55d56ee0.js"><link rel="prefetch" href="/assets/js/85.c9812f4e.js"><link rel="prefetch" href="/assets/js/86.a602866c.js"><link rel="prefetch" href="/assets/js/87.be5d5f6f.js"><link rel="prefetch" href="/assets/js/88.51040255.js"><link rel="prefetch" href="/assets/js/89.9540f1f4.js"><link rel="prefetch" href="/assets/js/9.c502c264.js"><link rel="prefetch" href="/assets/js/90.98220aae.js"><link rel="prefetch" href="/assets/js/91.d8e05f3c.js"><link rel="prefetch" href="/assets/js/92.9d105cf4.js"><link rel="prefetch" href="/assets/js/93.b96f7169.js"><link rel="prefetch" href="/assets/js/94.b450d42e.js"><link rel="prefetch" href="/assets/js/95.e336cfaa.js"><link rel="prefetch" href="/assets/js/96.fe469522.js"><link rel="prefetch" href="/assets/js/97.5fe20bcf.js"><link rel="prefetch" href="/assets/js/98.30a2af54.js"><link rel="prefetch" href="/assets/js/99.dfd7fd47.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.ac6383e3.js"> |
| <link rel="stylesheet" href="/assets/css/0.styles.679f71b6.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="/zh/" 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">文档</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/zh/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="/zh/SystemDesign/Architecture/Architecture.html" class="nav-link">系统设计</a></div><div class="nav-item"><a href="/zh/Download/" class="nav-link">下载</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">社区</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="/zh/Community/Community-Project Committers.html" class="nav-link">开发人员</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Community-Powered By.html" class="nav-link">技术支持</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Materials.html" class="nav-link">活动与报告</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Feedback.html" class="nav-link">交流与反馈</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">开发</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/Development/VoteRelease.html" class="nav-link">如何投票</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/HowToCommit.html" class="nav-link">如何提交代码</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/Committer.html" class="nav-link">成为Committer</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/ContributeGuide.html" class="nav-link">项目开发指南</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/format-changelist.html" class="nav-link">TsFile的更改列表</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/rpc-changelist.html" class="nav-link">RPC变更清单</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"> |
| 基金会 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external"> |
| 许可证 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external"> |
| 安全 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external"> |
| 赞助 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external"> |
| 致谢 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external"> |
| 活动 |
| <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">语言</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Operation Manual/DML Data Manipulation Language.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.x/Operation Manual/DML Data Manipulation Language.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">文档</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/zh/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="/zh/SystemDesign/Architecture/Architecture.html" class="nav-link">系统设计</a></div><div class="nav-item"><a href="/zh/Download/" class="nav-link">下载</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">社区</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="/zh/Community/Community-Project Committers.html" class="nav-link">开发人员</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Community-Powered By.html" class="nav-link">技术支持</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Materials.html" class="nav-link">活动与报告</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Feedback.html" class="nav-link">交流与反馈</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">开发</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/Development/VoteRelease.html" class="nav-link">如何投票</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/HowToCommit.html" class="nav-link">如何提交代码</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/Committer.html" class="nav-link">成为Committer</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/ContributeGuide.html" class="nav-link">项目开发指南</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/format-changelist.html" class="nav-link">TsFile的更改列表</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/rpc-changelist.html" class="nav-link">RPC变更清单</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"> |
| 基金会 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external"> |
| 许可证 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external"> |
| 安全 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external"> |
| 赞助 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external"> |
| 致谢 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external"> |
| 活动 |
| <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">语言</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Operation Manual/DML Data Manipulation Language.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.x/Operation Manual/DML Data Manipulation Language.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用户手册 (v0.10.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>开始</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概述</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>服务器端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>客户端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>操作指南</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/V0.10.x/Operation Manual/DDL Data Definition Language.html" class="sidebar-link">DDL (数据定义语言)</a></li><li><a href="/zh/UserGuide/V0.10.x/Operation Manual/DML Data Manipulation Language.html" class="active sidebar-link">DML (数据操作语言)</a></li><li><a href="/zh/UserGuide/V0.10.x/Operation Manual/Administration.html" class="sidebar-link">权限管理语句</a></li><li><a href="/zh/UserGuide/V0.10.x/Operation Manual/SQL Reference.html" class="sidebar-link">SQL 参考文档</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>生态集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统设计</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="dml-数据操作语言"><a href="#dml-数据操作语言" class="header-anchor">#</a> DML (数据操作语言)</h1> <h2 id="数据接入"><a href="#数据接入" class="header-anchor">#</a> 数据接入</h2> <p>IoTDB为用户提供多种插入实时数据的方式，例如在<a href="/zh/UserGuide/V0.10.x/Client/Command Line Interface.html">Cli/Shell工具</a>中直接输入插入数据的INSERT语句，或使用Java API（标准<a href="/zh/UserGuide/V0.10.x/Client/Programming - JDBC.html">Java JDBC</a>接口）单条或批量执行插入数据的INSERT语句。</p> <p>本节主要为您介绍实时数据接入的INSERT语句在场景中的实际使用示例，有关INSERT SQL语句的详细语法请参见本文<a href="/zh/UserGuide/V0.10.x/Operation Manual/SQL Reference.html">INSERT语句</a>节。</p> <h3 id="使用insert语句"><a href="#使用insert语句" class="header-anchor">#</a> 使用INSERT语句</h3> <p>使用INSERT语句可以向指定的已经创建的一条或多条时间序列中插入数据。对于每一条数据，均由一个时间戳类型的时间戳和一个数值或布尔值、字符串类型的传感器采集值组成。</p> <p>在本节的场景实例下，以其中的两个时间序列<code>root.ln.wf02.wt02.status</code>和<code>root.ln.wf02.wt02.hardware</code>为例 ，它们的数据类型分别为BOOLEAN和TEXT。</p> <p>单列数据插入示例代码如下：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB > insert into root.ln.wf02.wt02(timestamp,status) values(1,true) |
| IoTDB > insert into root.ln.wf02.wt02(timestamp,hardware) values(1, "v1") |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>以上示例代码将长整型的timestamp以及值为true的数据插入到时间序列<code>root.ln.wf02.wt02.status</code>中和将长整型的timestamp以及值为”v1”的数据插入到时间序列<code>root.ln.wf02.wt02.hardware</code>中。执行成功后会返回执行时间，代表数据插入已完成。</p> <blockquote><p>注意：在IoTDB中，TEXT类型的数据单双引号都可以来表示,上面的插入语句是用的是双引号表示TEXT类型数据，下面的示例将使用单引号表示TEXT类型数据。</p></blockquote> <p>INSERT语句还可以支持在同一个时间点下多列数据的插入，同时向2时间点插入上述两个时间序列的值，多列数据插入示例代码如下：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB > insert into root.ln.wf02.wt02(timestamp, status, hardware) VALUES (2, false, 'v2') |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>插入数据后我们可以使用SELECT语句简单查询已插入的数据。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB > select * from root.ln.wf02 where time < 3 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>结果如图所示。由查询结果可以看出，单列、多列数据的插入操作正确执行。 |
| <center><img src="https://user-images.githubusercontent.com/13203019/51605021-c2ee1500-1f48-11e9-8f6b-ba9b48875a41.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center></p> <h3 id="insert语句的错误处理"><a href="#insert语句的错误处理" class="header-anchor">#</a> INSERT语句的错误处理</h3> <p>若用户向一个不存在的时间序列中插入数据，例如执行以下命令：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB > insert into root.ln.wf02.wt02(timestamp, temperature) values(1,"v1") |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>由于<code>root.ln.wf02.wt02. temperature</code>时间序列不存在，系统将会返回以下ERROR告知该Timeseries路径不存在：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Msg: The resultDataType or encoding or compression of the last node temperature is conflicting in the storage group root.ln |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>若用户插入的数据类型与该Timeseries对应的数据类型不一致，例如执行以下命令：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB > insert into root.ln.wf02.wt02(timestamp,hardware) values(1,100) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>系统将会返回以下ERROR告知数据类型有误：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>error: The TEXT data type should be covered by " or ' |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="数据查询"><a href="#数据查询" class="header-anchor">#</a> 数据查询</h2> <h3 id="时间切片查询"><a href="#时间切片查询" class="header-anchor">#</a> 时间切片查询</h3> <p>本节主要介绍时间切片查询的相关示例，主要使用的是<a href="/zh/UserGuide/V0.10.x/Operation Manual/SQL Reference.html">IoTDB SELECT语句</a>。同时，您也可以使用<a href="/zh/UserGuide/V0.10.x/Client/Programming - JDBC.html">Java JDBC</a>标准接口来执行相关的查询语句。</p> <h4 id="根据一个时间区间选择一列数据"><a href="#根据一个时间区间选择一列数据" class="header-anchor">#</a> 根据一个时间区间选择一列数据</h4> <p>SQL语句为：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select temperature from root.ln.wf01.wt01 where time < 2017-11-01T00:08:00.000 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>其含义为：</p> <p>被选择的设备为ln集团wf01子站wt01设备；被选择的时间序列为温度传感器（temperature）；该语句要求选择出该设备在“2017-11-01T00:08:00.000”（此处可以使用多种时间格式，详情可参看<a href="/zh/UserGuide/V0.10.x/Concept/Data Model and Terminology.html">2.1节</a>）时间点以前的所有温度传感器的值。</p> <p>该SQL语句的执行结果如下：</p> <center><img src="https://user-images.githubusercontent.com/23614968/61280074-da1c0a00-a7e9-11e9-8eb8-3809428043a8.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <h4 id="根据一个时间区间选择多列数据"><a href="#根据一个时间区间选择多列数据" class="header-anchor">#</a> 根据一个时间区间选择多列数据</h4> <p>SQL语句为：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select status, temperature from root.ln.wf01.wt01 where time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>其含义为：</p> <p>被选择的设备为ln集团wf01子站wt01设备；被选择的时间序列为供电状态（status）和温度传感器（temperature）；该语句要求选择出“2017-11-01T00:05:00.000”至“2017-11-01T00:12:00.000”之间的所选时间序列的值。</p> <p>该SQL语句的执行结果如下：</p> <center><img src="https://user-images.githubusercontent.com/23614968/61280328-40a12800-a7ea-11e9-85b9-3b8db67673a3.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <h4 id="按照多个时间区间选择同一设备的多列数据"><a href="#按照多个时间区间选择同一设备的多列数据" class="header-anchor">#</a> 按照多个时间区间选择同一设备的多列数据</h4> <p>IoTDB支持在一次查询中指定多个时间区间条件，用户可以根据需求随意组合时间区间条件。例如，</p> <p>SQL语句为：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select status,temperature from root.ln.wf01.wt01 where (time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000) or (time >= 2017-11-01T16:35:00.000 and time <= 2017-11-01T16:37:00.000); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>其含义为：</p> <p>被选择的设备为ln集团wf01子站wt01设备；被选择的时间序列为“供电状态（status）”和“温度传感器（temperature）”；该语句指定了两个不同的时间区间，分别为“2017-11-01T00:05:00.000至2017-11-01T00:12:00.000”和“2017-11-01T16:35:00.000至2017-11-01T16:37:00.000”；该语句要求选择出满足任一时间区间的被选时间序列的值。</p> <p>该SQL语句的执行结果如下： |
| <center><img src="https://user-images.githubusercontent.com/23614968/61280449-780fd480-a7ea-11e9-8ed0-70fa9dfda80f.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center></p> <h4 id="按照多个时间区间选择不同设备的多列数据"><a href="#按照多个时间区间选择不同设备的多列数据" class="header-anchor">#</a> 按照多个时间区间选择不同设备的多列数据</h4> <p>该系统支持在一次查询中选择任意列的数据，也就是说，被选择的列可以来源于不同的设备。例如，SQL语句为：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select wf01.wt01.status,wf02.wt02.hardware from root.ln where (time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000) or (time >= 2017-11-01T16:35:00.000 and time <= 2017-11-01T16:37:00.000); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>其含义为：</p> <p>被选择的时间序列为“ln集团wf01子站wt01设备的供电状态”以及“ln集团wf02子站wt02设备的硬件版本”；该语句指定了两个时间区间，分别为“2017-11-01T00:05:00.000至2017-11-01T00:12:00.000”和“2017-11-01T16:35:00.000至2017-11-01T16:37:00.000”；该语句要求选择出满足任意时间区间的被选时间序列的值。</p> <p>该SQL语句的执行结果如下： |
| <center><img src="https://user-images.githubusercontent.com/13203019/51577450-dcfe0800-1ef4-11e9-9399-4ba2b2b7fb73.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center></p> <h4 id="其他结果返回形式"><a href="#其他结果返回形式" class="header-anchor">#</a> 其他结果返回形式</h4> <p>IoTDB支持另外两种结果返回形式: 按设备时间对齐 'align by device' 和 时序不对齐 'disable align'.</p> <p>'align by device' 对齐方式下，设备ID会单独作为一列出现。在 select 子句中写了多少列，最终结果就会有该列数+2 （时间列和设备名字列）。SQL形如:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select s1,s2 from root.sg1.* GROUP BY DEVICE |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>更多语法请参照 SQL REFERENCE.</p> <p>'disable align' 意味着每条时序就有3列存在。更多语法请参照 SQL REFERENCE.</p> <h3 id="降频聚合查询"><a href="#降频聚合查询" class="header-anchor">#</a> 降频聚合查询</h3> <p>本章节主要介绍降频聚合查询的相关示例， |
| 主要使用的是IoTDB SELECT语句的<a href="/zh/UserGuide/V0.10.x/Operation Manual/SQL Reference.html">GROUP BY子句</a>， |
| 该子句是IoTDB中用于根据用户给定划分条件对结果集进行划分，并对已划分的结果集进行聚合计算的语句。 |
| IoTDB支持根据时间间隔和自定义的滑动步长（默认值与时间间隔相同，自定义的值必须大于等于时间间隔）对结果集进行划分，默认结果按照时间升序排列。 |
| 同时，您也可以使用Java JDBC标准接口来执行相关的查询语句。</p> <p>GROUP BY语句为用户提供三类指定参数：</p> <ul><li>参数1：时间轴显示时间窗参数</li> <li>参数2：划分时间轴的时间间隔参数（必须为正数）</li> <li>参数3：滑动步长（可选参数，默认值与时间间隔相同，自定义的值必须大于等于时间间隔）</li></ul> <p>三类参数的实际含义已经在图5.2中指出，这三类参数里，第三个参数是可选的。 |
| 接下来，我们将给出三种典型的降频聚合查询的例子： |
| 滑动步长未指定， |
| 指定滑动步长， |
| 带值过滤条件。</p> <center><img src="https://user-images.githubusercontent.com/16079446/69109512-f808bc80-0ab2-11ea-9e4d-b2b2f58fb474.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> |
| **图 5.2 三类参数的实际含义**</center> <h4 id="未指定滑动步长的降频聚合查询"><a href="#未指定滑动步长的降频聚合查询" class="header-anchor">#</a> 未指定滑动步长的降频聚合查询</h4> <p>对应的SQL语句是:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select count(status), max_value(temperature) from root.ln.wf01.wt01 group by ([2017-11-01T00:00:00, 2017-11-07T23:00:00),1d); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这条查询的含义是:</p> <p>由于用户没有指定滑动步长，滑动步长将会被默认设置为跟时间间隔参数相同，也就是<code>1d</code>。</p> <p>上面这个例子的第一个参数是显示窗口参数，决定了最终的显示范围是[2017-11-01T00:00:00, 2017-11-07T23:00:00)。</p> <p>上面这个例子的第二个参数是划分时间轴的时间间隔参数，将<code>1d</code>当作划分间隔，显示窗口参数的起始时间当作分割原点，时间轴即被划分为连续的时间间隔：[0,1d), [1d, 2d), [2d, 3d)等等。</p> <p>然后系统将会用WHERE子句中的时间和值过滤条件以及GROUP BY语句中的第一个参数作为数据的联合过滤条件，获得满足所有过滤条件的数据（在这个例子里是在[2017-11-01T00:00:00, 2017-11-07 T23:00:00)这个时间范围的数据），并把这些数据映射到之前分割好的时间轴中（这个例子里是从2017-11-01T00:00:00到2017-11-07T23:00:00:00的每一天）</p> <p>每个时间间隔窗口内都有数据，SQL执行后的结果集如下所示：</p> <center><img src="https://user-images.githubusercontent.com/16079446/69116068-eed51b00-0ac5-11ea-9731-b5a45c5cd224.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <h4 id="指定滑动步长的降频聚合查询"><a href="#指定滑动步长的降频聚合查询" class="header-anchor">#</a> 指定滑动步长的降频聚合查询</h4> <p>对应的SQL语句是:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select count(status), max_value(temperature) from root.ln.wf01.wt01 group by ([2017-11-01 00:00:00, 2017-11-07 23:00:00), 3h, 1d); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这条查询的含义是:</p> <p>由于用户指定了滑动步长为<code>1d</code>，GROUP BY语句执行时将会每次把时间间隔往后移动一天的步长，而不是默认的3小时。</p> <p>也就意味着，我们想要取从2017-11-01到2017-11-07每一天的凌晨0点到凌晨3点的数据。</p> <p>上面这个例子的第一个参数是显示窗口参数，决定了最终的显示范围是[2017-11-01T00:00:00, 2017-11-07T23:00:00)。</p> <p>上面这个例子的第二个参数是划分时间轴的时间间隔参数，将<code>3h</code>当作划分间隔，显示窗口参数的起始时间当作分割原点，时间轴即被划分为连续的时间间隔：[2017-11-01T00:00:00, 2017-11-01T03:00:00), [2017-11-02T00:00:00, 2017-11-02T03:00:00), [2017-11-03T00:00:00, 2017-11-03T03:00:00)等等。</p> <p>上面这个例子的第三个参数是每次时间间隔的滑动步长。</p> <p>然后系统将会用WHERE子句中的时间和值过滤条件以及GROUP BY语句中的第一个参数作为数据的联合过滤条件，获得满足所有过滤条件的数据（在这个例子里是在[2017-11-01T00:00:00, 2017-11-07 T23:00:00)这个时间范围的数据），并把这些数据映射到之前分割好的时间轴中（这个例子里是从2017-11-01T00:00:00到2017-11-07T23:00:00:00的每一天的凌晨0点到凌晨3点）</p> <p>每个时间间隔窗口内都有数据，SQL执行后的结果集如下所示：</p> <center><img src="https://user-images.githubusercontent.com/16079446/69116083-f85e8300-0ac5-11ea-84f1-59d934eee96e.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <h4 id="带值过滤条件的降频聚合查询"><a href="#带值过滤条件的降频聚合查询" class="header-anchor">#</a> 带值过滤条件的降频聚合查询</h4> <p>对应的SQL语句是:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select count(status), max_value(temperature) from root.ln.wf01.wt01 where time > 2017-11-01T01:00:00 and temperature > 20 group by([2017-11-01T00:00:00, 2017-11-07T23:00:00), 3h, 1d); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这条查询的含义是:</p> <p>由于用户指定了滑动步长为<code>1d</code>，GROUP BY语句执行时将会每次把时间间隔往后移动一天的步长，而不是默认的3小时。</p> <p>也就意味着，我们想要取从2017-11-01到2017-11-07每一天的凌晨0点到凌晨3点的数据。</p> <p>上面这个例子的第一个参数是显示窗口参数，决定了最终的显示范围是[2017-11-01T00:00:00, 2017-11-07T23:00:00)。</p> <p>上面这个例子的第二个参数是划分时间轴的时间间隔参数，将<code>3h</code>当作划分间隔，显示窗口参数的起始时间当作分割原点，时间轴即被划分为连续的时间间隔：[2017-11-01T00:00:00, 2017-11-01T03:00:00), [2017-11-02T00:00:00, 2017-11-02T03:00:00), [2017-11-03T00:00:00, 2017-11-03T03:00:00)等等。</p> <p>上面这个例子的第三个参数是每次时间间隔的滑动步长。</p> <p>然后系统将会用WHERE子句中的时间和值过滤条件以及GROUP BY语句中的第一个参数作为数据的联合过滤条件，获得满足所有过滤条件的数据（在这个例子里是在[2017-11-01T00:00:00, 2017-11-07 T23:00:00)这个时间范围的并且满足root.ln.wf01.wt01.temperature > 20的数据），并把这些数据映射到之前分割好的时间轴中（这个例子里是从2017-11-01T00:00:00到2017-11-07T23:00:00:00的每一天的凌晨0点到凌晨3点）</p> <p>每个时间间隔窗口内都有数据，SQL执行后的结果集如下所示：</p> <center><img src="https://user-images.githubusercontent.com/16079446/69116088-001e2780-0ac6-11ea-9a01-dc45271d1dad.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <p>GROUP BY的SELECT子句里的查询路径必须是聚合函数，否则系统将会抛出如下对应的错误。</p> <center><img src="https://user-images.githubusercontent.com/16079446/69116099-0b715300-0ac6-11ea-8074-84e04797b8c7.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <h4 id="左开右闭区间"><a href="#左开右闭区间" class="header-anchor">#</a> 左开右闭区间</h4> <p>每个区间的结果时间戳为区间右端点，对应的SQL语句是:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select count(status) from root.ln.wf01.wt01 group by((5, 40], 5ms); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这条查询语句的时间区间是左开右闭的，结果中不会包含时间点5的数据，但是会包含时间点40的数据。</p> <p>SQL执行后的结果集如下所示：</p> <table><thead><tr><th>Time</th> <th>count(root.ln.wf01.wt01.status)</th></tr></thead> <tbody><tr><td>10</td> <td>1</td></tr> <tr><td>15</td> <td>2</td></tr> <tr><td>20</td> <td>3</td></tr> <tr><td>25</td> <td>4</td></tr> <tr><td>30</td> <td>4</td></tr> <tr><td>35</td> <td>3</td></tr> <tr><td>40</td> <td>5</td></tr></tbody></table> <h4 id="降频聚合查询补空值"><a href="#降频聚合查询补空值" class="header-anchor">#</a> 降频聚合查询补空值</h4> <p>降频聚合出的各个时间段的结果，支持使用前值补空。</p> <p>不允许设置滑动步长，默认为聚合时间区间，实际为定长采样。现在只支持 last_value 聚合函数。</p> <p>目前不支持线性插值补空值。</p> <h5 id="previous-和-previousuntillast-的区别"><a href="#previous-和-previousuntillast-的区别" class="header-anchor">#</a> PREVIOUS 和 PREVIOUSUNTILLAST 的区别</h5> <ul><li>PREVIOUS：只要空值前边有值，就会用其填充空值。</li> <li>PREVIOUSUNTILLAST：不会填充此序列最新点后的空值</li></ul> <p>SQL 示例:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT last_value(temperature) FROM root.ln.wf01.wt01 GROUP BY([8, 39), 5m) FILL (int32[PREVIOUSUNTILLAST]) |
| SELECT last_value(temperature) FROM root.ln.wf01.wt01 GROUP BY([8, 39), 5m) FILL (int32[PREVIOUSUNTILLAST, 3m]) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>解释:</p> <p>使用 PREVIOUSUNTILLAST 方式填充降频聚合的结果。</p> <p>所有路径必须都伴随聚合函数，否则会报以下错误信息：</p> <center><img src="https://user-images.githubusercontent.com/16079446/69116099-0b715300-0ac6-11ea-8074-84e04797b8c7.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <h3 id="最新数据查询"><a href="#最新数据查询" class="header-anchor">#</a> 最新数据查询</h3> <p>SQL语法：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select last <Path> [COMMA <Path>]* from < PrefixPath > [COMMA < PrefixPath >]* <DISABLE ALIGN> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>其含义是：查询时间序列prefixPath.path中最近时间戳的数据</p> <p>结果集为三列的结构</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>| Time | Path | Value | |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>示例 1：查询 root.ln.wf01.wt01.speed 的最新数据点</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>> select last speed from root.ln.wf01.wt01 |
| |
| | Time | Path | Value | |
| | --- | ----------------------- | ----- | |
| | 5 | root.ln.wf01.wt01.speed | 100 | |
| </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><p>示例 2：查询 root.ln.wf01.wt01 下 speed，status，temperature 的最新数据点</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>> select last speed, status, temperature from root.ln.wf01 |
| |
| | Time | Path | Value | |
| | --- | ---------------------------- | ----- | |
| | 5 | root.ln.wf01.wt01.speed | 100 | |
| | 7 | root.ln.wf01.wt01.status | true | |
| | 9 | root.ln.wf01.wt01.temperature| 35.7 | |
| </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><h3 id="自动填充"><a href="#自动填充" class="header-anchor">#</a> 自动填充</h3> <p>在IoTDB的实际使用中，当进行时间序列的查询操作时，可能会出现在某些时间点值为null的情况，这会妨碍用户进行进一步的分析。 为了更好地反映数据更改的程度，用户希望可以自动填充缺失值。 因此，IoTDB系统引入了自动填充功能。</p> <p>自动填充功能是指对单列或多列执行时间序列查询时，根据用户指定的方法和有效时间范围填充空值。 如果查询点的值不为null，则填充功能将不起作用。</p> <blockquote><p>注意：在当前版本中，IoTDB为用户提供两种方法：Previous 和Linear。 Previous 方法用前一个值填充空白。 Linear方法通过线性拟合来填充空白。 并且填充功能只能在执行时间点查询时使用。</p></blockquote> <h4 id="填充功能"><a href="#填充功能" class="header-anchor">#</a> 填充功能</h4> <ul><li>Previous功能</li></ul> <p>当查询的时间戳值为空时，将使用前一个时间戳的值来填充空白。 形式化的先前方法如下（有关详细语法，请参见第7.1.3.6节）：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select <path> from <prefixPath> where time = <T> fill(<data_type>[previous, <before_range>], …) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>表3-4给出了所有参数的详细说明。</p> <center>**表3-4previous填充参数列表** |
| <table><thead><tr><th style="text-align:left;">参数名称（不区分大小写）</th> <th style="text-align:left;">解释</th></tr></thead> <tbody><tr><td style="text-align:left;">path, prefixPath</td> <td style="text-align:left;">查询路径； 必填项</td></tr> <tr><td style="text-align:left;">T</td> <td style="text-align:left;">查询时间戳（只能指定一个）； 必填项</td></tr> <tr><td style="text-align:left;">data_type</td> <td style="text-align:left;">填充方法使用的数据类型。 可选值是int32，int64，float，double，boolean，text; 可选字段</td></tr> <tr><td style="text-align:left;">before_range</td> <td style="text-align:left;">表示前一种方法的有效时间范围。 当[T-before \ _range，T]范围内的值存在时，前一种方法将起作用。 如果未指定before_range，则before_range会使用默认值default_fill_interval; -1表示无穷大； 可选字段</td></tr></tbody></table></center> <p>在这里，我们举一个使用先前方法填充空值的示例。 SQL语句如下：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select temperature from root.sgcc.wf03.wt01 where time = 2017-11-01T16:37:50.000 fill(float[previous, 1m]) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>意思是：</p> <p>由于时间根目录root.sgcc.wf03.wt01.temperature在2017-11-01T16：37：50.000为空，因此系统使用以前的时间戳2017-11-01T16：37：00.000（且时间戳位于[2017-11-01T16:36:50.000, 2017-11-01T16:37:50.000]范围）进行填充和显示。</p> <p>在<a href="https://github.com/thulab/iotdb/files/4438687/OtherMaterial-Sample.Data.txt" target="_blank" rel="noopener noreferrer">样例数据中<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>, 该语句的执行结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577616-67df0280-1ef5-11e9-9dff-2eb8342074eb.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <p>值得注意的是，如果在指定的有效时间范围内没有值，系统将不会填充空值，如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577679-9f4daf00-1ef5-11e9-8d8b-06a58de6efc1.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <ul><li>Linear方法</li></ul> <p>当查询的时间戳值为空时，将使用前一个和下一个时间戳的值来填充空白。 形式化线性方法如下：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select <path> from <prefixPath> where time = <T> fill(<data_type>[linear, <before_range>, <after_range>]…) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>表3-5中给出了所有参数的详细说明。</p> <center>**表3-5线性填充参数列表** |
| <table><thead><tr><th style="text-align:left;">参数名称（不区分大小写）</th> <th style="text-align:left;">解释</th></tr></thead> <tbody><tr><td style="text-align:left;">path, prefixPath</td> <td style="text-align:left;">查询路径； 必填项</td></tr> <tr><td style="text-align:left;">T</td> <td style="text-align:left;">查询时间戳（只能指定一个）； 必填项</td></tr> <tr><td style="text-align:left;">data_type</td> <td style="text-align:left;">填充方法使用的数据类型。 可选值是int32，int64，float，double，boolean，text; 可选字段</td></tr> <tr><td style="text-align:left;">before_range, after_range</td> <td style="text-align:left;">表示线性方法的有效时间范围。 当[T-before_range，T + after_range]范围内的值存在时，前一种方法将起作用。 如果未明确指定before_range和after_range，则使用default_fill_interval。 -1表示无穷大； 可选字段</td></tr></tbody></table></center> <p>需要注意的是一旦时间序列在查询时间戳T时刻存在有效值，线性填充就回使用这个值作为结果返回。 |
| 除此之外，如果在[T-before_range，T]或[T, T + after_range]两个范围中任意一个范围内不存在有效填充值，则线性填充返回null值。</p> <p>在这里，我们举一个使用线性方法填充空值的示例。 SQL语句如下：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select temperature from root.sgcc.wf03.wt01 where time = 2017-11-01T16:37:50.000 fill(float [linear, 1m, 1m]) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>意思是：</p> <p>由于时间根目录root.sgcc.wf03.wt01.temperature在2017-11-01T16：37：50.000为空，因此系统使用以前的时间戳2017-11-01T16：37：00.000（且时间戳位于[2017- 11-01T16：36：50.000，2017-11-01T16：37：50.000]时间范围）及其值21.927326，下一个时间戳记2017-11-01T16：38：00.000（且时间戳记位于[2017-11-11] 01T16：37：50.000、2017-11-01T16：38：50.000]时间范围）及其值25.311783以执行线性拟合计算：</p> <p>21.927326 +（25.311783-21.927326）/ 60s * 50s = 24.747707</p> <p>在 <a href="https://github.com/thulab/iotdb/files/4438687/OtherMaterial-Sample.Data.txt" target="_blank" rel="noopener noreferrer">样例数据<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>, 该语句的执行结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577727-d4f29800-1ef5-11e9-8ff3-3bb519da3993.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <h4 id="数据类型和填充方法之间的对应关系"><a href="#数据类型和填充方法之间的对应关系" class="header-anchor">#</a> 数据类型和填充方法之间的对应关系</h4> <p>数据类型和支持的填充方法如表3-6所示。</p> <center>**表3-6数据类型和支持的填充方法** |
| <table><thead><tr><th style="text-align:left;">数据类型</th> <th style="text-align:left;">支持的填充方法</th></tr></thead> <tbody><tr><td style="text-align:left;">boolean</td> <td style="text-align:left;">previous</td></tr> <tr><td style="text-align:left;">int32</td> <td style="text-align:left;">previous, linear</td></tr> <tr><td style="text-align:left;">int64</td> <td style="text-align:left;">previous, linear</td></tr> <tr><td style="text-align:left;">float</td> <td style="text-align:left;">previous, linear</td></tr> <tr><td style="text-align:left;">double</td> <td style="text-align:left;">previous, linear</td></tr> <tr><td style="text-align:left;">text</td> <td style="text-align:left;">previous</td></tr></tbody></table></center> <p>值得注意的是，IoTDB将针对数据类型不支持的填充方法给出错误提示，如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577741-e340b400-1ef5-11e9-9238-a4eaf498ab84.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <p>如果未指定fill方法，则每种数据类型均具有其自己的默认fill方法和参数。 对应关系如表3-7所示。</p> <center>**表3-7各种数据类型的默认填充方法和参数** |
| <table><thead><tr><th style="text-align:left;">数据类型</th> <th style="text-align:left;">默认填充方法和参数</th></tr></thead> <tbody><tr><td style="text-align:left;">boolean</td> <td style="text-align:left;">previous, 600000</td></tr> <tr><td style="text-align:left;">int32</td> <td style="text-align:left;">linear, 600000, 600000</td></tr> <tr><td style="text-align:left;">int64</td> <td style="text-align:left;">linear, 600000, 600000</td></tr> <tr><td style="text-align:left;">float</td> <td style="text-align:left;">linear, 600000, 600000</td></tr> <tr><td style="text-align:left;">double</td> <td style="text-align:left;">linear, 600000, 600000</td></tr> <tr><td style="text-align:left;">text</td> <td style="text-align:left;">previous, 600000</td></tr></tbody></table></center> <blockquote><p>注意：应在Fill语句中至少指定一种填充方法。</p></blockquote> <h3 id="对查询结果的行和列控制"><a href="#对查询结果的行和列控制" class="header-anchor">#</a> 对查询结果的行和列控制</h3> <p>IoTDB提供 <a href="/zh/UserGuide/V0.10.x/Operation Manual/SQL Reference.html">LIMIT/SLIMIT</a> 子句和 <a href="/zh/UserGuide/V0.10.x/Operation Manual/SQL Reference.html">OFFSET/SOFFSET</a> 子句，以使用户可以更好地控制查询结果。使用LIMIT和SLIMIT子句可让用户控制查询结果的行数和列数， |
| 并且使用OFFSET和SOFSET子句允许用户设置结果显示的起始位置。</p> <p>请注意，按组查询不支持LIMIT和OFFSET。</p> <p>本章主要介绍查询结果的行和列控制的相关示例。你还可以使用 <a href="/zh/UserGuide/V0.10.x/Client/Programming - JDBC.html">Java JDBC</a> 标准接口执行查询。</p> <h4 id="查询结果的行控制"><a href="#查询结果的行控制" class="header-anchor">#</a> 查询结果的行控制</h4> <p>通过使用LIMIT和OFFSET子句，用户可以以与行相关的方式控制查询结果。 我们将通过以下示例演示如何使用LIMIT和OFFSET子句。</p> <ul><li>示例1：基本的LIMIT子句</li></ul> <p>SQL语句是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select status, temperature from root.ln.wf01.wt01 limit 10 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>意思是：</p> <p>所选设备为ln组wf01工厂wt01设备； 选择的时间序列是“状态”和“温度”。 SQL语句要求返回查询结果的前10行。</p> <p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577752-efc50c80-1ef5-11e9-9071-da2bbd8b9bdd.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <ul><li>示例2：带OFFSET的LIMIT子句</li></ul> <p>SQL语句是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select status, temperature from root.ln.wf01.wt01 limit 5 offset 3 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>意思是：</p> <p>所选设备为ln组wf01工厂wt01设备； 选择的时间序列是“状态”和“温度”。 SQL语句要求返回查询结果的第3至7行（第一行编号为0行）。</p> <p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577773-08352700-1ef6-11e9-883f-8d353bef2bdc.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <ul><li>示例3：LIMIT子句与WHERE子句结合</li></ul> <p>SQL语句是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select status,temperature from root.ln.wf01.wt01 where time > 2017-11-01T00:05:00.000 and time< 2017-11-01T00:12:00.000 limit 2 offset 3 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>意思是：</p> <p>所选设备为ln组wf01工厂wt01设备； 选择的时间序列是“状态”和“温度”。 SQL语句要求返回时间“ 2017-11-01T00：05：00.000”和“ 2017-11-01T00：12：00.000”之间的状态和温度传感器值的第3至4行（第一行） 编号为第0行）。</p> <p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577789-15521600-1ef6-11e9-86ca-d7b2c947367f.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <ul><li>示例4：LIMIT子句与GROUP BY子句组合</li></ul> <p>SQL语句是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select count(status), max_value(temperature) from root.ln.wf01.wt01 group by ([2017-11-01T00:00:00, 2017-11-07T23:00:00),1d) limit 5 offset 3 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>意思是：</p> <p>SQL语句子句要求返回查询结果的第3至7行（第一行编号为0行）。</p> <p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577796-1e42e780-1ef6-11e9-8987-be443000a77e.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <p>值得注意的是，由于当前的FILL子句只能在某个时间点填充时间序列的缺失值，也就是说，FILL子句的执行结果恰好是一行，因此LIMIT和OFFSET不会是 与FILL子句结合使用，否则将提示错误。 例如，执行以下SQL语句：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select temperature from root.sgcc.wf03.wt01 where time = 2017-11-01T16:37:50.000 fill(float[previous, 1m]) limit 10 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>SQL语句将不会执行，并且相应的错误提示如下：</p> <center><img src="https://user-images.githubusercontent.com/19167280/61517266-6e2fe080-aa39-11e9-8015-154a8e8ace30.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <h4 id="查询结果的列控制"><a href="#查询结果的列控制" class="header-anchor">#</a> 查询结果的列控制</h4> <p>通过使用LIMIT和OFFSET子句，用户可以以与列相关的方式控制查询结果。 我们将通过以下示例演示如何使用SLIMIT和OFFSET子句。</p> <ul><li>示例1：基本的SLIMIT子句</li></ul> <p>SQL语句是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select * from root.ln.wf01.wt01 where time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000 slimit 1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>意思是：</p> <p>所选设备为ln组wf01工厂wt01设备； 所选时间序列是该设备下的第一列，即电源状态。 SQL语句要求在“ 2017-11-01T00：05：00.000”和“ 2017-11-01T00：12：00.000”的时间点之间选择状态传感器值。</p> <p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577813-30bd2100-1ef6-11e9-94ef-dbeb450cf319.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <ul><li>示例2：带OFFSET的LIMIT子句</li></ul> <p>SQL语句是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select * from root.ln.wf01.wt01 where time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000 slimit 1 soffset 1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>意思是：</p> <p>所选设备为ln组wf01工厂wt01设备； 所选时间序列是该设备下的第二列，即温度。 SQL语句要求在“ 2017-11-01T00：05：00.000”和“ 2017-11-01T00：12：00.000”的时间点之间选择温度传感器值。</p> <p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577827-39adf280-1ef6-11e9-81b5-876769607cd2.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <ul><li>示例3：SLIMIT子句与GROUP BY子句结合</li></ul> <p>SQL语句是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select max_value(*) from root.ln.wf01.wt01 group by ([2017-11-01T00:00:00, 2017-11-07T23:00:00),1d) slimit 1 soffset 1 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577840-44688780-1ef6-11e9-8abc-04ae78efa85b.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <ul><li>示例4：SLIMIT子句与FILL子句结合</li></ul> <p>SQL语句是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select * from root.sgcc.wf03.wt01 where time = 2017-11-01T16:37:50.000 fill(float[previous, 1m]) slimit 1 soffset 1 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>意思是：</p> <p>所选设备为ln组wf01工厂wt01设备； 所选时间序列是该设备下的第二列，即温度。</p> <p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577855-4d595900-1ef6-11e9-8541-a4accd714b75.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <p>值得注意的是，预期SLIMIT子句将与星形路径或前缀路径一起使用，并且当SLIMIT子句与完整路径查询一起使用时，系统将提示错误。 例如，执行以下SQL语句：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select status,temperature from root.ln.wf01.wt01 where time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000 slimit 1 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>SQL语句将不会执行，并且相应的错误提示如下：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577867-577b5780-1ef6-11e9-978c-e02c1294bcc5.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <h4 id="控制查询结果的行和列"><a href="#控制查询结果的行和列" class="header-anchor">#</a> 控制查询结果的行和列</h4> <p>除了对查询结果进行行或列控制之外，IoTDB还允许用户控制查询结果的行和列。 这是同时包含LIMIT子句和SLIMIT子句的完整示例。</p> <p>SQL语句是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select * from root.ln.wf01.wt01 limit 10 offset 100 slimit 2 soffset 0 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>意思是：</p> <p>所选设备为ln组wf01工厂wt01设备； 所选时间序列是此设备下的第0列至第1列（第一列编号为第0列）。 SQL语句子句要求返回查询结果的第100至109行（第一行编号为0行）。</p> <p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51577879-64984680-1ef6-11e9-9d7b-57dd60fab60e.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <h4 id="其他结果集格式"><a href="#其他结果集格式" class="header-anchor">#</a> 其他结果集格式</h4> <p>此外，IoTDB支持两种其他结果集格式：“按设备对齐”和“禁用对齐”。</p> <p>“按设备对齐”指示将deviceId视为一列。 因此，数据集中的列完全有限。</p> <p>SQL语句是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select s1,s2 from root.sg1.* GROUP BY DEVICE |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>有关更多语法描述，请阅读SQL REFERENCE。</p> <p>“禁用对齐”指示结果集中每个时间序列都有3列。 有关更多语法描述，请阅读SQL REFERENCE。</p> <h4 id="错误处理"><a href="#错误处理" class="header-anchor">#</a> 错误处理</h4> <p>当LIMIT / SLIMIT的参数N / SN超过结果集的大小时，IoTDB将按预期返回所有结果。 例如，原始SQL语句的查询结果由六行组成，我们通过LIMIT子句选择前100行：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select status,temperature from root.ln.wf01.wt01 where time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000 limit 100 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51578187-ad9cca80-1ef7-11e9-897a-83e66a0f3d94.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <p>当LIMIT / SLIMIT子句的参数N / SN超过允许的最大值（N / SN的类型为int32）时，系统将提示错误。 例如，执行以下SQL语句：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select status,temperature from root.ln.wf01.wt01 where time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000 limit 1234567890123456789 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>SQL语句将不会执行，并且相应的错误提示如下：</p> <center><img src="https://user-images.githubusercontent.com/19167280/61517469-e696a180-aa39-11e9-8ca5-42ea991d520e.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <p>当LIMIT / LIMIT子句的参数N / SN不是正整数时，系统将提示错误。 例如，执行以下SQL语句：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select status,temperature from root.ln.wf01.wt01 where time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000 limit 13.1 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>SQL语句将不会执行，并且相应的错误提示如下：</p> <center><img src="https://user-images.githubusercontent.com/19167280/61518094-68d39580-aa3b-11e9-993c-fc73c27540f7.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <p>当LIMIT子句的参数OFFSET超过结果集的大小时，IoTDB将返回空结果集。 例如，执行以下SQL语句：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select status,temperature from root.ln.wf01.wt01 where time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000 limit 2 offset 6 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>结果如下所示：</p> <center><img src="https://user-images.githubusercontent.com/13203019/51578227-c60ce500-1ef7-11e9-98eb-175beb8d4086.jpg" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"></center> <p>当SLIMIT子句的参数SOFFSET不小于可用时间序列数时，系统将提示错误。 例如，执行以下SQL语句：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select * from root.ln.wf01.wt01 where time > 2017-11-01T00:05:00.000 and time < 2017-11-01T00:12:00.000 slimit 1 soffset 2 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>SQL语句将不会执行，并且相应的错误提示如下：</p> <h3 id="数据删除"><a href="#数据删除" class="header-anchor">#</a> 数据删除</h3> <p>用户使用<a href="/zh/UserGuide/V0.10.x/Operation Manual/SQL Reference.html">DELETE语句</a>可以删除指定的时间序列中符合时间删除条件的数据。在删除数据时，用户可以选择需要删除的一个或多个时间序列、时间序列的前缀、时间序列带*路径对某时间之前的数据进行删除（当前版本暂不支持删除某一闭时间区间范围内的数据）。</p> <p>在JAVA编程环境中，您可以使用JDBC API单条或批量执行DELETE语句。</p> <h4 id="单传感器时间序列值删除"><a href="#单传感器时间序列值删除" class="header-anchor">#</a> 单传感器时间序列值删除</h4> <p>以测控ln集团为例，存在这样的使用场景：</p> <p>wf02子站的wt02设备在2017-11-01 16:26:00之前的供电状态出现多段错误，且无法分析其正确数据，错误数据影响了与其他设备的关联分析。此时，需要将此时间段前的数据删除。进行此操作的SQL语句为：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>delete from root.ln.wf02.wt02.status where time<=2017-11-01T16:26:00; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h4 id="多传感器时间序列值删除"><a href="#多传感器时间序列值删除" class="header-anchor">#</a> 多传感器时间序列值删除</h4> <p>当ln集团wf02子站的wt02设备在2017-11-01 16:26:00之前的供电状态和设备硬件版本都需要删除，此时可以使用含义更广的<a href="/zh/UserGuide/V0.10.x/Concept/Data Model and Terminology.html">前缀路径或带<code>*</code>路径</a>进行删除操作，进行此操作的SQL语句为：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>delete from root.ln.wf02.wt02 where time <= 2017-11-01T16:26:00; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>或</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>delete from root.ln.wf02.wt02.* where time <= 2017-11-01T16:26:00; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>需要注意的是，当删除的路径不存在时，IoTDB会提示路径不存在，无法删除数据，如下所示。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> delete from root.ln.wf03.wt02.status where time < now() |
| Msg: TimeSeries does not exist and its data cannot be deleted |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev"> |
| ← |
| <a href="/zh/UserGuide/V0.10.x/Operation Manual/DDL Data Definition Language.html" class="prev"> |
| DDL (数据定义语言) |
| </a></span> <span class="next"><a href="/zh/UserGuide/V0.10.x/Operation Manual/Administration.html"> |
| 权限管理语句 |
| </a> |
| → |
| </span></p></div> <p style="text-align: center;">Copyright © 2020 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.9d485032.js" defer></script><script src="/assets/js/3.80bccc99.js" defer></script><script src="/assets/js/389.f449e4ea.js" defer></script> |
| </body> |
| </html> |
