| <!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 1.8.2"> |
| <link rel="icon" href="/favicon.ico"> |
| <script async="true" src="https://www.googletagmanager.com/gtag/js?id=G-5MM3J6X84E"></script> |
| <script> |
| window.dataLayer = window.dataLayer || []; |
| function gtag(){dataLayer.push(arguments);} |
| gtag('js', new Date()); |
| gtag('config', 'G-5MM3J6X84E');</script> |
| <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.dfd59be6.css" as="style"><link rel="preload" href="/assets/js/app.b493877d.js" as="script"><link rel="preload" href="/assets/js/3.36f2a167.js" as="script"><link rel="preload" href="/assets/js/4.e8b2d372.js" as="script"><link rel="preload" href="/assets/js/506.2b860a4f.js" as="script"><link rel="prefetch" href="/assets/js/10.4edb8739.js"><link rel="prefetch" href="/assets/js/100.e32c1884.js"><link rel="prefetch" href="/assets/js/101.5909abfd.js"><link rel="prefetch" href="/assets/js/102.588b06d4.js"><link rel="prefetch" href="/assets/js/103.7e65f01d.js"><link rel="prefetch" href="/assets/js/104.6bb8c242.js"><link rel="prefetch" href="/assets/js/105.2d9f8734.js"><link rel="prefetch" href="/assets/js/106.dcfe5738.js"><link rel="prefetch" href="/assets/js/107.2617673c.js"><link rel="prefetch" href="/assets/js/108.30a4e7cb.js"><link rel="prefetch" href="/assets/js/109.60758941.js"><link rel="prefetch" href="/assets/js/11.e6c21699.js"><link rel="prefetch" href="/assets/js/110.60f90cfb.js"><link rel="prefetch" href="/assets/js/111.0bbb389c.js"><link rel="prefetch" href="/assets/js/112.8b8306b4.js"><link rel="prefetch" href="/assets/js/113.769e45d8.js"><link rel="prefetch" href="/assets/js/114.30875d22.js"><link rel="prefetch" href="/assets/js/115.de49e92f.js"><link rel="prefetch" href="/assets/js/116.0675918c.js"><link rel="prefetch" href="/assets/js/117.7fce739a.js"><link rel="prefetch" href="/assets/js/118.016d52ef.js"><link rel="prefetch" href="/assets/js/119.a98e04d4.js"><link rel="prefetch" href="/assets/js/12.2ebfdd53.js"><link rel="prefetch" href="/assets/js/120.733d4263.js"><link rel="prefetch" href="/assets/js/121.437bbfdf.js"><link rel="prefetch" href="/assets/js/122.1d44b351.js"><link rel="prefetch" href="/assets/js/123.c86d9177.js"><link rel="prefetch" href="/assets/js/124.30d86f64.js"><link rel="prefetch" href="/assets/js/125.105359a4.js"><link rel="prefetch" href="/assets/js/126.be1a5b7d.js"><link rel="prefetch" href="/assets/js/127.05bbd29c.js"><link rel="prefetch" href="/assets/js/128.2ab6413d.js"><link rel="prefetch" href="/assets/js/129.e0df372c.js"><link rel="prefetch" href="/assets/js/13.16053ad6.js"><link rel="prefetch" href="/assets/js/130.b5d1ff78.js"><link rel="prefetch" href="/assets/js/131.edd4d915.js"><link rel="prefetch" href="/assets/js/132.66eace9a.js"><link rel="prefetch" href="/assets/js/133.f6fe673f.js"><link rel="prefetch" href="/assets/js/134.d5449535.js"><link rel="prefetch" href="/assets/js/135.5afdfb12.js"><link rel="prefetch" href="/assets/js/136.be202224.js"><link rel="prefetch" href="/assets/js/137.69f033b0.js"><link rel="prefetch" href="/assets/js/138.53570517.js"><link rel="prefetch" href="/assets/js/139.d7b8ccbd.js"><link rel="prefetch" href="/assets/js/14.f8f59c2a.js"><link rel="prefetch" href="/assets/js/140.15f4a301.js"><link rel="prefetch" href="/assets/js/141.e78e96af.js"><link rel="prefetch" href="/assets/js/142.4b3c6341.js"><link rel="prefetch" href="/assets/js/143.b61da33d.js"><link rel="prefetch" href="/assets/js/144.13109098.js"><link rel="prefetch" href="/assets/js/145.2910703a.js"><link rel="prefetch" href="/assets/js/146.eee785de.js"><link rel="prefetch" href="/assets/js/147.9c5f9108.js"><link rel="prefetch" href="/assets/js/148.446dc146.js"><link rel="prefetch" href="/assets/js/149.b47a8c64.js"><link rel="prefetch" href="/assets/js/15.0e7120ba.js"><link rel="prefetch" href="/assets/js/150.be260406.js"><link rel="prefetch" href="/assets/js/151.f08b8df7.js"><link rel="prefetch" href="/assets/js/152.bfc874dc.js"><link rel="prefetch" href="/assets/js/153.908354d0.js"><link rel="prefetch" href="/assets/js/154.acbc0b06.js"><link rel="prefetch" href="/assets/js/155.54ff81f0.js"><link rel="prefetch" href="/assets/js/156.ad4ed76e.js"><link rel="prefetch" href="/assets/js/157.f57294ab.js"><link rel="prefetch" href="/assets/js/158.6b6b86c4.js"><link rel="prefetch" href="/assets/js/159.eef8e1b8.js"><link rel="prefetch" href="/assets/js/16.295928b4.js"><link rel="prefetch" href="/assets/js/160.4173f4df.js"><link rel="prefetch" href="/assets/js/161.48c44020.js"><link rel="prefetch" href="/assets/js/162.d51fd9a5.js"><link rel="prefetch" href="/assets/js/163.7888bce7.js"><link rel="prefetch" href="/assets/js/164.b571c627.js"><link rel="prefetch" href="/assets/js/165.426ee975.js"><link rel="prefetch" href="/assets/js/166.7a34ba2e.js"><link rel="prefetch" href="/assets/js/167.f9e7d6d7.js"><link rel="prefetch" href="/assets/js/168.2e424591.js"><link rel="prefetch" href="/assets/js/169.86a80840.js"><link rel="prefetch" href="/assets/js/17.2559538f.js"><link rel="prefetch" href="/assets/js/170.ec91aa0a.js"><link rel="prefetch" href="/assets/js/171.4b2e72bb.js"><link rel="prefetch" href="/assets/js/172.c09b4f97.js"><link rel="prefetch" href="/assets/js/173.da75a148.js"><link rel="prefetch" href="/assets/js/174.6f73adde.js"><link rel="prefetch" href="/assets/js/175.ad315790.js"><link rel="prefetch" href="/assets/js/176.3f724699.js"><link rel="prefetch" href="/assets/js/177.a3151747.js"><link rel="prefetch" href="/assets/js/178.3c9a3a4f.js"><link rel="prefetch" href="/assets/js/179.a910aed2.js"><link rel="prefetch" href="/assets/js/18.c946fc9e.js"><link rel="prefetch" href="/assets/js/180.b86e3e39.js"><link rel="prefetch" href="/assets/js/181.9b677b06.js"><link rel="prefetch" href="/assets/js/182.2a2e360e.js"><link rel="prefetch" href="/assets/js/183.8616e397.js"><link rel="prefetch" href="/assets/js/184.2f0ba776.js"><link rel="prefetch" href="/assets/js/185.b2bc837d.js"><link rel="prefetch" href="/assets/js/186.cda442f1.js"><link rel="prefetch" href="/assets/js/187.5add055b.js"><link rel="prefetch" href="/assets/js/188.b61258f5.js"><link rel="prefetch" href="/assets/js/189.650362a1.js"><link rel="prefetch" href="/assets/js/19.e2982c39.js"><link rel="prefetch" href="/assets/js/190.8cf8dd44.js"><link rel="prefetch" href="/assets/js/191.e6a5c5f1.js"><link rel="prefetch" href="/assets/js/192.2c81cd91.js"><link rel="prefetch" href="/assets/js/193.dff24d42.js"><link rel="prefetch" href="/assets/js/194.a23ae658.js"><link rel="prefetch" href="/assets/js/195.403fa29d.js"><link rel="prefetch" href="/assets/js/196.14bdaad4.js"><link rel="prefetch" href="/assets/js/197.039e1f8b.js"><link rel="prefetch" href="/assets/js/198.6e74aa45.js"><link rel="prefetch" href="/assets/js/199.bbab6676.js"><link rel="prefetch" href="/assets/js/20.e1823e38.js"><link rel="prefetch" href="/assets/js/200.8d16b664.js"><link rel="prefetch" href="/assets/js/201.0134faf9.js"><link rel="prefetch" href="/assets/js/202.e1e62160.js"><link rel="prefetch" href="/assets/js/203.71cb4dd3.js"><link rel="prefetch" href="/assets/js/204.f8940c37.js"><link rel="prefetch" href="/assets/js/205.89dba9c4.js"><link rel="prefetch" href="/assets/js/206.208c13e4.js"><link rel="prefetch" href="/assets/js/207.1abee6d6.js"><link rel="prefetch" href="/assets/js/208.ddd4c6a5.js"><link rel="prefetch" href="/assets/js/209.96d1f749.js"><link rel="prefetch" href="/assets/js/21.c721b8b4.js"><link rel="prefetch" href="/assets/js/210.6761a8e9.js"><link rel="prefetch" href="/assets/js/211.ac8a1ad6.js"><link rel="prefetch" href="/assets/js/212.e879965e.js"><link rel="prefetch" href="/assets/js/213.13ef564a.js"><link rel="prefetch" href="/assets/js/214.843f4613.js"><link rel="prefetch" href="/assets/js/215.f386e217.js"><link rel="prefetch" href="/assets/js/216.8b000a2e.js"><link rel="prefetch" href="/assets/js/217.9e0dbcea.js"><link rel="prefetch" href="/assets/js/218.d66cc109.js"><link rel="prefetch" href="/assets/js/219.e10cec2e.js"><link rel="prefetch" href="/assets/js/22.15bc349b.js"><link rel="prefetch" href="/assets/js/220.6db1650f.js"><link rel="prefetch" href="/assets/js/221.124d6abc.js"><link rel="prefetch" href="/assets/js/222.f30c55b3.js"><link rel="prefetch" href="/assets/js/223.ab2fdf0f.js"><link rel="prefetch" href="/assets/js/224.735d57cc.js"><link rel="prefetch" href="/assets/js/225.72ca67cb.js"><link rel="prefetch" href="/assets/js/226.98987095.js"><link rel="prefetch" href="/assets/js/227.37336d0b.js"><link rel="prefetch" href="/assets/js/228.11249673.js"><link rel="prefetch" href="/assets/js/229.798ef046.js"><link rel="prefetch" href="/assets/js/23.8bd0de87.js"><link rel="prefetch" href="/assets/js/230.4e6f23cd.js"><link rel="prefetch" href="/assets/js/231.01c2a835.js"><link rel="prefetch" href="/assets/js/232.abbd8004.js"><link rel="prefetch" href="/assets/js/233.a480915d.js"><link rel="prefetch" href="/assets/js/234.ad956d43.js"><link rel="prefetch" href="/assets/js/235.edbb351a.js"><link rel="prefetch" href="/assets/js/236.b2bbee7d.js"><link rel="prefetch" href="/assets/js/237.7c0a8e17.js"><link rel="prefetch" href="/assets/js/238.58f49362.js"><link rel="prefetch" href="/assets/js/239.bac6f876.js"><link rel="prefetch" href="/assets/js/24.3bebd8b6.js"><link rel="prefetch" href="/assets/js/240.f5c0e21d.js"><link rel="prefetch" href="/assets/js/241.6c71b230.js"><link rel="prefetch" href="/assets/js/242.6253e232.js"><link rel="prefetch" href="/assets/js/243.c7f2c552.js"><link rel="prefetch" href="/assets/js/244.596c7ad8.js"><link rel="prefetch" href="/assets/js/245.a691fc3e.js"><link rel="prefetch" href="/assets/js/246.04447706.js"><link rel="prefetch" href="/assets/js/247.051e9d20.js"><link rel="prefetch" href="/assets/js/248.c99d28e0.js"><link rel="prefetch" href="/assets/js/249.fe553ecc.js"><link rel="prefetch" href="/assets/js/25.827045e3.js"><link rel="prefetch" href="/assets/js/250.dce53728.js"><link rel="prefetch" href="/assets/js/251.5260896e.js"><link rel="prefetch" href="/assets/js/252.6c3d7cbf.js"><link rel="prefetch" href="/assets/js/253.154f41ff.js"><link rel="prefetch" href="/assets/js/254.e98223a7.js"><link rel="prefetch" href="/assets/js/255.cfa855d1.js"><link rel="prefetch" href="/assets/js/256.3b5dbf32.js"><link rel="prefetch" href="/assets/js/257.2e81ec35.js"><link rel="prefetch" href="/assets/js/258.c9c30010.js"><link rel="prefetch" href="/assets/js/259.0893a2dd.js"><link rel="prefetch" href="/assets/js/26.c8060b33.js"><link rel="prefetch" href="/assets/js/260.e3d297a8.js"><link rel="prefetch" href="/assets/js/261.d88ceb4a.js"><link rel="prefetch" href="/assets/js/262.7b6efe91.js"><link rel="prefetch" href="/assets/js/263.133d7c04.js"><link rel="prefetch" href="/assets/js/264.25538a8b.js"><link rel="prefetch" href="/assets/js/265.6cb51f52.js"><link rel="prefetch" href="/assets/js/266.5e58393b.js"><link rel="prefetch" href="/assets/js/267.7eeedb25.js"><link rel="prefetch" href="/assets/js/268.9bb37490.js"><link rel="prefetch" href="/assets/js/269.51fe45aa.js"><link rel="prefetch" href="/assets/js/27.2476b973.js"><link rel="prefetch" href="/assets/js/270.a63d78bb.js"><link rel="prefetch" href="/assets/js/271.f092eb51.js"><link rel="prefetch" href="/assets/js/272.218101f9.js"><link rel="prefetch" href="/assets/js/273.cc9005ca.js"><link rel="prefetch" href="/assets/js/274.21ea2106.js"><link rel="prefetch" href="/assets/js/275.f3c98861.js"><link rel="prefetch" href="/assets/js/276.6cbbbc45.js"><link rel="prefetch" href="/assets/js/277.95c6d871.js"><link rel="prefetch" href="/assets/js/278.a9a3c538.js"><link rel="prefetch" href="/assets/js/279.697c6519.js"><link rel="prefetch" href="/assets/js/28.830d54da.js"><link rel="prefetch" href="/assets/js/280.320c45a2.js"><link rel="prefetch" href="/assets/js/281.16c9f5fc.js"><link rel="prefetch" href="/assets/js/282.49292916.js"><link rel="prefetch" href="/assets/js/283.770627b9.js"><link rel="prefetch" href="/assets/js/284.63b23c43.js"><link rel="prefetch" href="/assets/js/285.1f54bcd2.js"><link rel="prefetch" href="/assets/js/286.435ffe43.js"><link rel="prefetch" href="/assets/js/287.000fe1ed.js"><link rel="prefetch" href="/assets/js/288.2ee3fbcf.js"><link rel="prefetch" href="/assets/js/289.ae848c11.js"><link rel="prefetch" href="/assets/js/29.6a364fd5.js"><link rel="prefetch" href="/assets/js/290.808b31b2.js"><link rel="prefetch" href="/assets/js/291.3db95b5d.js"><link rel="prefetch" href="/assets/js/292.0723d246.js"><link rel="prefetch" href="/assets/js/293.ad46fb07.js"><link rel="prefetch" href="/assets/js/294.f8b1688d.js"><link rel="prefetch" href="/assets/js/295.8aa15473.js"><link rel="prefetch" href="/assets/js/296.837d11ce.js"><link rel="prefetch" href="/assets/js/297.b7da2058.js"><link rel="prefetch" href="/assets/js/298.f6e8dbd4.js"><link rel="prefetch" href="/assets/js/299.f57ee830.js"><link rel="prefetch" href="/assets/js/30.c3589f5c.js"><link rel="prefetch" href="/assets/js/300.fb63423a.js"><link rel="prefetch" href="/assets/js/301.b3b4c61a.js"><link rel="prefetch" href="/assets/js/302.f51ce0db.js"><link rel="prefetch" href="/assets/js/303.81f8dae8.js"><link rel="prefetch" href="/assets/js/304.abe43f4a.js"><link rel="prefetch" href="/assets/js/305.03cb72cf.js"><link rel="prefetch" href="/assets/js/306.949f9ae7.js"><link rel="prefetch" href="/assets/js/307.dae20420.js"><link rel="prefetch" href="/assets/js/308.08db3d19.js"><link rel="prefetch" href="/assets/js/309.205ee0e1.js"><link rel="prefetch" href="/assets/js/31.747d17ce.js"><link rel="prefetch" href="/assets/js/310.e266d5d8.js"><link rel="prefetch" href="/assets/js/311.c3b33b32.js"><link rel="prefetch" href="/assets/js/312.a6059eac.js"><link rel="prefetch" href="/assets/js/313.b54eda30.js"><link rel="prefetch" href="/assets/js/314.7e5f5e65.js"><link rel="prefetch" href="/assets/js/315.ac1b4f72.js"><link rel="prefetch" href="/assets/js/316.a5a26b74.js"><link rel="prefetch" href="/assets/js/317.e167d1ff.js"><link rel="prefetch" href="/assets/js/318.6f794c9e.js"><link rel="prefetch" href="/assets/js/319.40e76b8f.js"><link rel="prefetch" href="/assets/js/32.386fc03f.js"><link rel="prefetch" href="/assets/js/320.3acf519a.js"><link rel="prefetch" href="/assets/js/321.26da8d77.js"><link rel="prefetch" href="/assets/js/322.0e756129.js"><link rel="prefetch" href="/assets/js/323.fb53ed25.js"><link rel="prefetch" href="/assets/js/324.ed0450b6.js"><link rel="prefetch" href="/assets/js/325.92df50c7.js"><link rel="prefetch" href="/assets/js/326.8c9baf46.js"><link rel="prefetch" href="/assets/js/327.9d67b4f9.js"><link rel="prefetch" href="/assets/js/328.b195e945.js"><link rel="prefetch" href="/assets/js/329.a9823cb8.js"><link rel="prefetch" href="/assets/js/33.aa1d80a6.js"><link rel="prefetch" href="/assets/js/330.28e4fe7b.js"><link rel="prefetch" href="/assets/js/331.2c16c983.js"><link rel="prefetch" href="/assets/js/332.f5b604d3.js"><link rel="prefetch" href="/assets/js/333.29070082.js"><link rel="prefetch" href="/assets/js/334.11ac71e8.js"><link rel="prefetch" href="/assets/js/335.a3fbb804.js"><link rel="prefetch" href="/assets/js/336.aca8d1cf.js"><link rel="prefetch" href="/assets/js/337.e93dc74c.js"><link rel="prefetch" href="/assets/js/338.0611d618.js"><link rel="prefetch" href="/assets/js/339.2c93b9de.js"><link rel="prefetch" href="/assets/js/34.fec188a0.js"><link rel="prefetch" href="/assets/js/340.e46de74f.js"><link rel="prefetch" href="/assets/js/341.0881e5ca.js"><link rel="prefetch" href="/assets/js/342.043c8a1d.js"><link rel="prefetch" href="/assets/js/343.b774d66b.js"><link rel="prefetch" href="/assets/js/344.7a03e1db.js"><link rel="prefetch" href="/assets/js/345.cbb88596.js"><link rel="prefetch" href="/assets/js/346.a50ffc5b.js"><link rel="prefetch" href="/assets/js/347.1079bfe2.js"><link rel="prefetch" href="/assets/js/348.2c2befda.js"><link rel="prefetch" href="/assets/js/349.4177df47.js"><link rel="prefetch" href="/assets/js/35.a7511c1e.js"><link rel="prefetch" href="/assets/js/350.03dbee9d.js"><link rel="prefetch" href="/assets/js/351.ed9940bc.js"><link rel="prefetch" href="/assets/js/352.b340afad.js"><link rel="prefetch" href="/assets/js/353.a2910e2e.js"><link rel="prefetch" href="/assets/js/354.62dfd436.js"><link rel="prefetch" href="/assets/js/355.a6f060c7.js"><link rel="prefetch" href="/assets/js/356.cfb7e8b6.js"><link rel="prefetch" href="/assets/js/357.abac2fb8.js"><link rel="prefetch" href="/assets/js/358.f9d8624e.js"><link rel="prefetch" href="/assets/js/359.c669b554.js"><link rel="prefetch" href="/assets/js/36.a68024d7.js"><link rel="prefetch" href="/assets/js/360.06951807.js"><link rel="prefetch" href="/assets/js/361.1c71afee.js"><link rel="prefetch" href="/assets/js/362.f9189a4c.js"><link rel="prefetch" href="/assets/js/363.0a958dca.js"><link rel="prefetch" href="/assets/js/364.cd36a8f1.js"><link rel="prefetch" href="/assets/js/365.cb5e6e9d.js"><link rel="prefetch" href="/assets/js/366.30576bcf.js"><link rel="prefetch" href="/assets/js/367.9efe7b95.js"><link rel="prefetch" href="/assets/js/368.d01bce84.js"><link rel="prefetch" href="/assets/js/369.e8e46e27.js"><link rel="prefetch" href="/assets/js/37.c842407e.js"><link rel="prefetch" href="/assets/js/370.f5f79c2d.js"><link rel="prefetch" href="/assets/js/371.fbf13f43.js"><link rel="prefetch" href="/assets/js/372.c12399fe.js"><link rel="prefetch" href="/assets/js/373.21e4ee34.js"><link rel="prefetch" href="/assets/js/374.02e17c1a.js"><link rel="prefetch" href="/assets/js/375.e374f6a6.js"><link rel="prefetch" href="/assets/js/376.f6c40562.js"><link rel="prefetch" href="/assets/js/377.6bf2f369.js"><link rel="prefetch" href="/assets/js/378.c1d19a6d.js"><link rel="prefetch" href="/assets/js/379.e7245460.js"><link rel="prefetch" href="/assets/js/38.528abae0.js"><link rel="prefetch" href="/assets/js/380.fd53c683.js"><link rel="prefetch" href="/assets/js/381.4778a324.js"><link rel="prefetch" href="/assets/js/382.b653ad40.js"><link rel="prefetch" href="/assets/js/383.8b3bf864.js"><link rel="prefetch" href="/assets/js/384.2532636e.js"><link rel="prefetch" href="/assets/js/385.512629c1.js"><link rel="prefetch" href="/assets/js/386.a516646c.js"><link rel="prefetch" href="/assets/js/387.df5cfccf.js"><link rel="prefetch" href="/assets/js/388.c05fe31a.js"><link rel="prefetch" href="/assets/js/389.aba06cdb.js"><link rel="prefetch" href="/assets/js/39.22df932f.js"><link rel="prefetch" href="/assets/js/390.a597fdab.js"><link rel="prefetch" href="/assets/js/391.382ea1ad.js"><link rel="prefetch" href="/assets/js/392.494ed939.js"><link rel="prefetch" href="/assets/js/393.e12395f8.js"><link rel="prefetch" href="/assets/js/394.f4cde47c.js"><link rel="prefetch" href="/assets/js/395.9bd210d3.js"><link rel="prefetch" href="/assets/js/396.08d84206.js"><link rel="prefetch" href="/assets/js/397.1da90060.js"><link rel="prefetch" href="/assets/js/398.56c016a8.js"><link rel="prefetch" href="/assets/js/399.32e967be.js"><link rel="prefetch" href="/assets/js/40.ee3735f7.js"><link rel="prefetch" href="/assets/js/400.c3600c71.js"><link rel="prefetch" href="/assets/js/401.986c9ff8.js"><link rel="prefetch" href="/assets/js/402.d372d7b3.js"><link rel="prefetch" href="/assets/js/403.b8d028bb.js"><link rel="prefetch" href="/assets/js/404.705ba8d2.js"><link rel="prefetch" href="/assets/js/405.37b0c141.js"><link rel="prefetch" href="/assets/js/406.bad0224d.js"><link rel="prefetch" href="/assets/js/407.6c21844a.js"><link rel="prefetch" href="/assets/js/408.26e11019.js"><link rel="prefetch" href="/assets/js/409.d7189740.js"><link rel="prefetch" href="/assets/js/41.a56f0e0d.js"><link rel="prefetch" href="/assets/js/410.10d7e9ff.js"><link rel="prefetch" href="/assets/js/411.d9151642.js"><link rel="prefetch" href="/assets/js/412.724d1b0f.js"><link rel="prefetch" href="/assets/js/413.2775c8b8.js"><link rel="prefetch" href="/assets/js/414.bdbf3f0a.js"><link rel="prefetch" href="/assets/js/415.e86badf8.js"><link rel="prefetch" href="/assets/js/416.f5289796.js"><link rel="prefetch" href="/assets/js/417.d7bff4dc.js"><link rel="prefetch" href="/assets/js/418.a382a0d5.js"><link rel="prefetch" href="/assets/js/419.673ae298.js"><link rel="prefetch" href="/assets/js/42.c88c6cb7.js"><link rel="prefetch" href="/assets/js/420.b897090a.js"><link rel="prefetch" href="/assets/js/421.cba01f3d.js"><link rel="prefetch" href="/assets/js/422.6717d347.js"><link rel="prefetch" href="/assets/js/423.3b565c5f.js"><link rel="prefetch" href="/assets/js/424.bc189702.js"><link rel="prefetch" href="/assets/js/425.b13cf7e2.js"><link rel="prefetch" href="/assets/js/426.85facae9.js"><link rel="prefetch" href="/assets/js/427.cd9d1117.js"><link rel="prefetch" href="/assets/js/428.5382765c.js"><link rel="prefetch" href="/assets/js/429.85fcab26.js"><link rel="prefetch" href="/assets/js/43.f317f65a.js"><link rel="prefetch" href="/assets/js/430.0b22b153.js"><link rel="prefetch" href="/assets/js/431.abb01683.js"><link rel="prefetch" href="/assets/js/432.8fc14eca.js"><link rel="prefetch" href="/assets/js/433.5ed8e668.js"><link rel="prefetch" href="/assets/js/434.45967f53.js"><link rel="prefetch" href="/assets/js/435.1d46d1f1.js"><link rel="prefetch" href="/assets/js/436.bce2f434.js"><link rel="prefetch" href="/assets/js/437.4aedbf63.js"><link rel="prefetch" href="/assets/js/438.c932adec.js"><link rel="prefetch" href="/assets/js/439.feddfb3c.js"><link rel="prefetch" href="/assets/js/44.cea02a90.js"><link rel="prefetch" href="/assets/js/440.a858448d.js"><link rel="prefetch" href="/assets/js/441.a6f61670.js"><link rel="prefetch" href="/assets/js/442.fc764806.js"><link rel="prefetch" href="/assets/js/443.2856d42a.js"><link rel="prefetch" href="/assets/js/444.ede02c55.js"><link rel="prefetch" href="/assets/js/445.a38db554.js"><link rel="prefetch" href="/assets/js/446.7a074dbc.js"><link rel="prefetch" href="/assets/js/447.7b1adc9b.js"><link rel="prefetch" href="/assets/js/448.f7fb6ce4.js"><link rel="prefetch" href="/assets/js/449.5164d5c4.js"><link rel="prefetch" href="/assets/js/45.84143f3d.js"><link rel="prefetch" href="/assets/js/450.1f2d7b55.js"><link rel="prefetch" href="/assets/js/451.576350e3.js"><link rel="prefetch" href="/assets/js/452.d7f0d7c4.js"><link rel="prefetch" href="/assets/js/453.76dad370.js"><link rel="prefetch" href="/assets/js/454.114f66a3.js"><link rel="prefetch" href="/assets/js/455.75ba38f5.js"><link rel="prefetch" href="/assets/js/456.74f0af71.js"><link rel="prefetch" href="/assets/js/457.a18caa33.js"><link rel="prefetch" href="/assets/js/458.610ca0ae.js"><link rel="prefetch" href="/assets/js/459.5fda757e.js"><link rel="prefetch" href="/assets/js/46.4f4f600c.js"><link rel="prefetch" href="/assets/js/460.305198e1.js"><link rel="prefetch" href="/assets/js/461.c6769bd2.js"><link rel="prefetch" href="/assets/js/462.884af178.js"><link rel="prefetch" href="/assets/js/463.1e03891c.js"><link rel="prefetch" href="/assets/js/464.a0cfdf31.js"><link rel="prefetch" href="/assets/js/465.da82bf35.js"><link rel="prefetch" href="/assets/js/466.eb0f0bc4.js"><link rel="prefetch" href="/assets/js/467.f970a38a.js"><link rel="prefetch" href="/assets/js/468.cc9bc069.js"><link rel="prefetch" href="/assets/js/469.7e24e317.js"><link rel="prefetch" href="/assets/js/47.391d6d34.js"><link rel="prefetch" href="/assets/js/470.e46175db.js"><link rel="prefetch" href="/assets/js/471.8aa6e226.js"><link rel="prefetch" href="/assets/js/472.e7408a09.js"><link rel="prefetch" href="/assets/js/473.0ec972d4.js"><link rel="prefetch" href="/assets/js/474.d6dfbb70.js"><link rel="prefetch" href="/assets/js/475.dfe3f963.js"><link rel="prefetch" href="/assets/js/476.d90c8c3b.js"><link rel="prefetch" href="/assets/js/477.a77ca598.js"><link rel="prefetch" href="/assets/js/478.d35e1d75.js"><link rel="prefetch" href="/assets/js/479.bb449662.js"><link rel="prefetch" href="/assets/js/48.9c982d00.js"><link rel="prefetch" href="/assets/js/480.2999750d.js"><link rel="prefetch" href="/assets/js/481.4a0bc1ab.js"><link rel="prefetch" href="/assets/js/482.eea7f179.js"><link rel="prefetch" href="/assets/js/483.49da315e.js"><link rel="prefetch" href="/assets/js/484.95c9d494.js"><link rel="prefetch" href="/assets/js/485.66272af9.js"><link rel="prefetch" href="/assets/js/486.3c655941.js"><link rel="prefetch" href="/assets/js/487.28dec17e.js"><link rel="prefetch" href="/assets/js/488.d7ce882f.js"><link rel="prefetch" href="/assets/js/489.a32e1e8c.js"><link rel="prefetch" href="/assets/js/49.068aaa41.js"><link rel="prefetch" href="/assets/js/490.e52db144.js"><link rel="prefetch" href="/assets/js/491.910fda30.js"><link rel="prefetch" href="/assets/js/492.58d91109.js"><link rel="prefetch" href="/assets/js/493.1f5fc3a7.js"><link rel="prefetch" href="/assets/js/494.3d110a73.js"><link rel="prefetch" href="/assets/js/495.0bd92481.js"><link rel="prefetch" href="/assets/js/496.3efe41c9.js"><link rel="prefetch" href="/assets/js/497.8afea5c8.js"><link rel="prefetch" href="/assets/js/498.c7064f63.js"><link rel="prefetch" href="/assets/js/499.d12c6987.js"><link rel="prefetch" href="/assets/js/5.73be05a2.js"><link rel="prefetch" href="/assets/js/50.d51914be.js"><link rel="prefetch" href="/assets/js/500.0a64abde.js"><link rel="prefetch" href="/assets/js/501.9d4ecc40.js"><link rel="prefetch" href="/assets/js/502.ca9f5142.js"><link rel="prefetch" href="/assets/js/503.a0bcf2c4.js"><link rel="prefetch" href="/assets/js/504.cd4d2520.js"><link rel="prefetch" href="/assets/js/505.b141fc2f.js"><link rel="prefetch" href="/assets/js/507.2b7ea9f3.js"><link rel="prefetch" href="/assets/js/508.f9f4a83e.js"><link rel="prefetch" href="/assets/js/509.9a4450cc.js"><link rel="prefetch" href="/assets/js/51.23e52d62.js"><link rel="prefetch" href="/assets/js/510.155850e5.js"><link rel="prefetch" href="/assets/js/511.6e36e45a.js"><link rel="prefetch" href="/assets/js/512.1d702ed3.js"><link rel="prefetch" href="/assets/js/513.44742583.js"><link rel="prefetch" href="/assets/js/514.b0c5aeea.js"><link rel="prefetch" href="/assets/js/515.7c516c01.js"><link rel="prefetch" href="/assets/js/516.f758113c.js"><link rel="prefetch" href="/assets/js/517.e31aa14e.js"><link rel="prefetch" href="/assets/js/518.42a6607b.js"><link rel="prefetch" href="/assets/js/519.fe7b1c58.js"><link rel="prefetch" href="/assets/js/52.0052906b.js"><link rel="prefetch" href="/assets/js/520.9491165d.js"><link rel="prefetch" href="/assets/js/521.c3d7975f.js"><link rel="prefetch" href="/assets/js/522.f8b7ae9d.js"><link rel="prefetch" href="/assets/js/523.dc10895f.js"><link rel="prefetch" href="/assets/js/524.6a0e377a.js"><link rel="prefetch" href="/assets/js/525.e696d9f7.js"><link rel="prefetch" href="/assets/js/526.07d802e0.js"><link rel="prefetch" href="/assets/js/527.a2efdb2c.js"><link rel="prefetch" href="/assets/js/528.82faddc6.js"><link rel="prefetch" href="/assets/js/529.e1ea61e6.js"><link rel="prefetch" href="/assets/js/53.355eef4b.js"><link rel="prefetch" href="/assets/js/530.bad2a4c4.js"><link rel="prefetch" href="/assets/js/531.7a29c383.js"><link rel="prefetch" href="/assets/js/532.becd54dc.js"><link rel="prefetch" href="/assets/js/533.8be096c9.js"><link rel="prefetch" href="/assets/js/534.6f2850f2.js"><link rel="prefetch" href="/assets/js/535.e5e1699d.js"><link rel="prefetch" href="/assets/js/536.525c8c35.js"><link rel="prefetch" href="/assets/js/537.bbe1ce1c.js"><link rel="prefetch" href="/assets/js/538.eed3705e.js"><link rel="prefetch" href="/assets/js/539.94bfc732.js"><link rel="prefetch" href="/assets/js/54.9e6534d4.js"><link rel="prefetch" href="/assets/js/540.bdad07fa.js"><link rel="prefetch" href="/assets/js/541.8951025b.js"><link rel="prefetch" href="/assets/js/542.311e6acf.js"><link rel="prefetch" href="/assets/js/543.5168ab7a.js"><link rel="prefetch" href="/assets/js/544.6197286e.js"><link rel="prefetch" href="/assets/js/545.5b1b96b7.js"><link rel="prefetch" href="/assets/js/546.219c08f2.js"><link rel="prefetch" href="/assets/js/547.26afb7f1.js"><link rel="prefetch" href="/assets/js/548.66fa5527.js"><link rel="prefetch" href="/assets/js/549.8b903f92.js"><link rel="prefetch" href="/assets/js/55.cad6aefd.js"><link rel="prefetch" href="/assets/js/550.e8b09ede.js"><link rel="prefetch" href="/assets/js/551.bccd9e7d.js"><link rel="prefetch" href="/assets/js/552.b2582603.js"><link rel="prefetch" href="/assets/js/553.c674a7dd.js"><link rel="prefetch" href="/assets/js/554.99eb0e76.js"><link rel="prefetch" href="/assets/js/555.208ce960.js"><link rel="prefetch" href="/assets/js/556.4217fff1.js"><link rel="prefetch" href="/assets/js/557.28938fbc.js"><link rel="prefetch" href="/assets/js/558.ef2b224e.js"><link rel="prefetch" href="/assets/js/559.1e362c69.js"><link rel="prefetch" href="/assets/js/56.f701ac7d.js"><link rel="prefetch" href="/assets/js/560.3e425f64.js"><link rel="prefetch" href="/assets/js/561.cae07e2f.js"><link rel="prefetch" href="/assets/js/562.e24b7e8d.js"><link rel="prefetch" href="/assets/js/563.4f934e4d.js"><link rel="prefetch" href="/assets/js/564.fb2b3f95.js"><link rel="prefetch" href="/assets/js/565.ef91b9cb.js"><link rel="prefetch" href="/assets/js/566.9373466d.js"><link rel="prefetch" href="/assets/js/567.dc16d0e9.js"><link rel="prefetch" href="/assets/js/568.b092decc.js"><link rel="prefetch" href="/assets/js/569.acad8f8c.js"><link rel="prefetch" href="/assets/js/57.c4bbdc48.js"><link rel="prefetch" href="/assets/js/570.41236922.js"><link rel="prefetch" href="/assets/js/571.3621a653.js"><link rel="prefetch" href="/assets/js/572.e51007a3.js"><link rel="prefetch" href="/assets/js/573.5d9cdcbf.js"><link rel="prefetch" href="/assets/js/574.40b0ac96.js"><link rel="prefetch" href="/assets/js/575.98e3fafe.js"><link rel="prefetch" href="/assets/js/576.bbe12bb4.js"><link rel="prefetch" href="/assets/js/577.5a68e9ec.js"><link rel="prefetch" href="/assets/js/578.b1fafbe7.js"><link rel="prefetch" href="/assets/js/579.e91083d6.js"><link rel="prefetch" href="/assets/js/58.4dba1e1e.js"><link rel="prefetch" href="/assets/js/580.0e98798b.js"><link rel="prefetch" href="/assets/js/581.49aecccc.js"><link rel="prefetch" href="/assets/js/582.68c764f4.js"><link rel="prefetch" href="/assets/js/583.1b1717c3.js"><link rel="prefetch" href="/assets/js/584.01d9a07a.js"><link rel="prefetch" href="/assets/js/585.fd225339.js"><link rel="prefetch" href="/assets/js/586.f2c93803.js"><link rel="prefetch" href="/assets/js/587.402e97af.js"><link rel="prefetch" href="/assets/js/588.11351c65.js"><link rel="prefetch" href="/assets/js/589.b92ab06a.js"><link rel="prefetch" href="/assets/js/59.72422de6.js"><link rel="prefetch" href="/assets/js/590.e549e9eb.js"><link rel="prefetch" href="/assets/js/591.bf714fd3.js"><link rel="prefetch" href="/assets/js/592.401448c4.js"><link rel="prefetch" href="/assets/js/593.b308c70f.js"><link rel="prefetch" href="/assets/js/594.874a9d1e.js"><link rel="prefetch" href="/assets/js/595.7576e6f0.js"><link rel="prefetch" href="/assets/js/596.f7791fe6.js"><link rel="prefetch" href="/assets/js/597.1920607d.js"><link rel="prefetch" href="/assets/js/598.6ba8d0e3.js"><link rel="prefetch" href="/assets/js/599.b1b37575.js"><link rel="prefetch" href="/assets/js/6.5a8223c6.js"><link rel="prefetch" href="/assets/js/60.282a495f.js"><link rel="prefetch" href="/assets/js/600.a68f0fa8.js"><link rel="prefetch" href="/assets/js/601.9e0ce5d9.js"><link rel="prefetch" href="/assets/js/602.623982b3.js"><link rel="prefetch" href="/assets/js/603.c219d4c2.js"><link rel="prefetch" href="/assets/js/604.6dfe7aa7.js"><link rel="prefetch" href="/assets/js/605.93614f30.js"><link rel="prefetch" href="/assets/js/606.f664e53e.js"><link rel="prefetch" href="/assets/js/607.f7a35555.js"><link rel="prefetch" href="/assets/js/608.dd82c709.js"><link rel="prefetch" href="/assets/js/609.785eaf86.js"><link rel="prefetch" href="/assets/js/61.96ccb830.js"><link rel="prefetch" href="/assets/js/610.20254122.js"><link rel="prefetch" href="/assets/js/611.a01c7312.js"><link rel="prefetch" href="/assets/js/612.9437a7f2.js"><link rel="prefetch" href="/assets/js/613.ed2feedd.js"><link rel="prefetch" href="/assets/js/614.a964280b.js"><link rel="prefetch" href="/assets/js/615.5280a555.js"><link rel="prefetch" href="/assets/js/616.6e1ab28f.js"><link rel="prefetch" href="/assets/js/617.8b586d26.js"><link rel="prefetch" href="/assets/js/618.455cdfd0.js"><link rel="prefetch" href="/assets/js/619.c0557adc.js"><link rel="prefetch" href="/assets/js/62.4b8d1565.js"><link rel="prefetch" href="/assets/js/620.756eabeb.js"><link rel="prefetch" href="/assets/js/621.002ea3c1.js"><link rel="prefetch" href="/assets/js/622.53148bda.js"><link rel="prefetch" href="/assets/js/623.7730d16d.js"><link rel="prefetch" href="/assets/js/624.156c7c4c.js"><link rel="prefetch" href="/assets/js/625.4635817f.js"><link rel="prefetch" href="/assets/js/626.c016ec2d.js"><link rel="prefetch" href="/assets/js/627.7b5a06e4.js"><link rel="prefetch" href="/assets/js/628.0232199c.js"><link rel="prefetch" href="/assets/js/629.64c57f4d.js"><link rel="prefetch" href="/assets/js/63.88c4f28c.js"><link rel="prefetch" href="/assets/js/630.b4e07501.js"><link rel="prefetch" href="/assets/js/631.e1447175.js"><link rel="prefetch" href="/assets/js/632.7df4e665.js"><link rel="prefetch" href="/assets/js/633.c6caf1a9.js"><link rel="prefetch" href="/assets/js/634.363ac8b3.js"><link rel="prefetch" href="/assets/js/635.f9fa7c7f.js"><link rel="prefetch" href="/assets/js/636.9132c6ad.js"><link rel="prefetch" href="/assets/js/637.e6cc7db7.js"><link rel="prefetch" href="/assets/js/638.6c0a88b6.js"><link rel="prefetch" href="/assets/js/639.f7cc6473.js"><link rel="prefetch" href="/assets/js/64.9a6df426.js"><link rel="prefetch" href="/assets/js/640.c2b4cc27.js"><link rel="prefetch" href="/assets/js/641.ab38aace.js"><link rel="prefetch" href="/assets/js/642.55223fb2.js"><link rel="prefetch" href="/assets/js/643.56768b79.js"><link rel="prefetch" href="/assets/js/644.69805af7.js"><link rel="prefetch" href="/assets/js/645.08c756b1.js"><link rel="prefetch" href="/assets/js/646.465916bd.js"><link rel="prefetch" href="/assets/js/647.317cd52a.js"><link rel="prefetch" href="/assets/js/648.037a16a8.js"><link rel="prefetch" href="/assets/js/649.c18e5bf3.js"><link rel="prefetch" href="/assets/js/65.f744bda5.js"><link rel="prefetch" href="/assets/js/650.f3119261.js"><link rel="prefetch" href="/assets/js/651.317905f4.js"><link rel="prefetch" href="/assets/js/652.fea1d9e9.js"><link rel="prefetch" href="/assets/js/653.3fe6e9b1.js"><link rel="prefetch" href="/assets/js/66.db50b75d.js"><link rel="prefetch" href="/assets/js/67.dace53ae.js"><link rel="prefetch" href="/assets/js/68.a528b703.js"><link rel="prefetch" href="/assets/js/69.9e6a4770.js"><link rel="prefetch" href="/assets/js/7.8b0df68c.js"><link rel="prefetch" href="/assets/js/70.846f7657.js"><link rel="prefetch" href="/assets/js/71.373b6020.js"><link rel="prefetch" href="/assets/js/72.638bf82c.js"><link rel="prefetch" href="/assets/js/73.bf3f33f7.js"><link rel="prefetch" href="/assets/js/74.07e41cb4.js"><link rel="prefetch" href="/assets/js/75.4df0ecfb.js"><link rel="prefetch" href="/assets/js/76.d6158739.js"><link rel="prefetch" href="/assets/js/77.bfaf08a4.js"><link rel="prefetch" href="/assets/js/78.b1c8cfd8.js"><link rel="prefetch" href="/assets/js/79.2ad5f6f1.js"><link rel="prefetch" href="/assets/js/8.9dde7893.js"><link rel="prefetch" href="/assets/js/80.32870e7f.js"><link rel="prefetch" href="/assets/js/81.c2340fba.js"><link rel="prefetch" href="/assets/js/82.d0aed17d.js"><link rel="prefetch" href="/assets/js/83.d9a7ebd1.js"><link rel="prefetch" href="/assets/js/84.ab419ff1.js"><link rel="prefetch" href="/assets/js/85.4d728e57.js"><link rel="prefetch" href="/assets/js/86.8e43b113.js"><link rel="prefetch" href="/assets/js/87.d5b61489.js"><link rel="prefetch" href="/assets/js/88.361d9ec9.js"><link rel="prefetch" href="/assets/js/89.306565de.js"><link rel="prefetch" href="/assets/js/9.15e59c54.js"><link rel="prefetch" href="/assets/js/90.ba2f03a3.js"><link rel="prefetch" href="/assets/js/91.6255df98.js"><link rel="prefetch" href="/assets/js/92.7e91a195.js"><link rel="prefetch" href="/assets/js/93.e8819b8d.js"><link rel="prefetch" href="/assets/js/94.77bc851b.js"><link rel="prefetch" href="/assets/js/95.3a681bae.js"><link rel="prefetch" href="/assets/js/96.037fe0f8.js"><link rel="prefetch" href="/assets/js/97.5ab7c0f0.js"><link rel="prefetch" href="/assets/js/98.f4474edd.js"><link rel="prefetch" href="/assets/js/99.609b0738.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.1288603f.js"> |
| <link rel="stylesheet" href="/assets/css/0.styles.dfd59be6.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/QuickStart/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.12.x/QuickStart/QuickStart.html" class="nav-link">V0.12.x</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="/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/V0.11.x/Operation Manual/DML Data Manipulation Language.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.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/QuickStart/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.12.x/QuickStart/QuickStart.html" class="nav-link">V0.12.x</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="/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/V0.11.x/Operation Manual/DML Data Manipulation Language.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.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 (V0.11.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/V0.11.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/V0.11.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/V0.11.x/Operation Manual/Administration.html" class="sidebar-link">权限管理语句</a></li><li><a href="/zh/UserGuide/V0.11.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/V0.11.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/V0.11.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/V0.11.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/V0.11.x/Operation Manual/SQL Reference.html">IoTDB SELECT语句</a>。同时，您也可以使用<a href="/zh/UserGuide/V0.11.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/V0.11.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="根据时间降序返回"><a href="#根据时间降序返回" class="header-anchor">#</a> 根据时间降序返回</h4> <p>IoTDB 在 0.11 版本开始支持 'order by time' 语句, 用于对结果按照时间进行降序展示。例如，SQL语句为：</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">></span> <span class="token number">1</span> <span class="token keyword">order</span> <span class="token keyword">by</span> <span class="token keyword">time</span> <span class="token keyword">desc</span> <span class="token keyword">limit</span> <span class="token number">10</span><span class="token punctuation">;</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>更多语法请参照 <a href="/zh/UserGuide/V0.11.x/Operation Manual/SQL Reference.html">SQL REFERENCE</a>.</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="聚合查询"><a href="#聚合查询" class="header-anchor">#</a> 聚合查询</h3> <p>本章节主要介绍聚合查询的相关示例， |
| 主要使用的是IoTDB SELECT语句的聚合查询函数。</p> <h4 id="统计总点数"><a href="#统计总点数" class="header-anchor">#</a> 统计总点数</h4> <div class="language- line-numbers-mode"><pre class="language-text"><code>select count(status) from root.ln.wf01.wt01; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><table><thead><tr><th>count(root.ln.wf01.wt01.status)</th></tr></thead> <tbody><tr><td>4</td></tr></tbody></table> <h5 id="按层级统计"><a href="#按层级统计" class="header-anchor">#</a> 按层级统计</h5> <p>通过定义LEVEL来统计指定层级下的数据点个数。</p> <p>这可以用来查询不同层级下的数据点总个数</p> <p>语法是：</p> <p>这个可以用来查询某个路径下的总数据点数</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select count(status) from root.ln.wf01.wt01 group by level=1; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><table><thead><tr><th>Time</th> <th>count(root.ln)</th></tr></thead> <tbody><tr><td>0</td> <td>7</td></tr></tbody></table> <div class="language- line-numbers-mode"><pre class="language-text"><code>select count(status) from root.ln.wf01.wt01 group by level=2; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><table><thead><tr><th>Time</th> <th>count(root.ln.wf01)</th> <th>count(root.ln.wf02)</th></tr></thead> <tbody><tr><td>0</td> <td>4</td> <td>3</td></tr></tbody></table> <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/V0.11.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="降采样后按level聚合查询"><a href="#降采样后按level聚合查询" class="header-anchor">#</a> 降采样后按Level聚合查询</h4> <p>除此之外，还可以通过定义LEVEL来统计指定层级下的数据点个数。</p> <p>例如：</p> <p>统计降采样后的数据点个数</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select count(status) from root.ln.wf01.wt01 group by ([0,20),3ms), level=1; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><table><thead><tr><th>Time</th> <th>count(root.ln)</th></tr></thead> <tbody><tr><td>0</td> <td>1</td></tr> <tr><td>3</td> <td>0</td></tr> <tr><td>6</td> <td>0</td></tr> <tr><td>9</td> <td>1</td></tr> <tr><td>12</td> <td>3</td></tr> <tr><td>15</td> <td>0</td></tr> <tr><td>18</td> <td>0</td></tr></tbody></table> <p>加上滑动Step的降采样后的结果也可以汇总</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select count(status) from root.ln.wf01.wt01 group by ([0,20),2ms,3ms), level=1; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><table><thead><tr><th>Time</th> <th>count(root.ln)</th></tr></thead> <tbody><tr><td>0</td> <td>1</td></tr> <tr><td>3</td> <td>0</td></tr> <tr><td>6</td> <td>0</td></tr> <tr><td>9</td> <td>0</td></tr> <tr><td>12</td> <td>2</td></tr> <tr><td>15</td> <td>0</td></tr> <tr><td>18</td> <td>0</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 >]* <WhereClause> |
| </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><WhereClause>中当前只支持含有'>'或'>='的时间过滤条件，任何其他过滤条件都将会返回异常。</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 时间戳大于等于5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 where time >= 5 |
| |
| | 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/V0.11.x/Operation Manual/SQL Reference.html">LIMIT/SLIMIT</a> 子句和 <a href="/zh/UserGuide/V0.11.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/V0.11.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> <h3 id="使用别名"><a href="#使用别名" class="header-anchor">#</a> 使用别名</h3> <p>由于 IoTDB 独特的数据模型，在每个传感器前都附带有设备等诸多额外信息。有时，我们只针对某个具体设备查询，而这些前缀信息频繁显示造成了冗余，影响了结果集的显示与分析。这时我们可以使用 IoTDB 提供的 AS 函数，将查询中出现的时间序列给定一个别名。</p> <p>例如：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select s1 as temperature, s2 as speed from root.ln.wf01.wt01; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>则结果集将显示为：</p> <table><thead><tr><th>Time</th> <th>temperature</th> <th>speed</th></tr></thead> <tbody><tr><td>...</td> <td>...</td> <td>...</td></tr></tbody></table> <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.* ALIGN 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/V0.11.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*路径对某一个时间区间内的数据进行删除。</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><p>如果我们仅仅想要删除2017年内的在2017-11-01 16:26:00之前的数据，可以使用以下SQL:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>delete from root.ln.wf02.wt02.status where time>=2017-01-01T00:00:00 and time<=2017-11-01T16:26:00; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>IoTDB 支持删除一个时间序列任何一个时间范围内的所有时序点，用户可以使用以下SQL语句指定需要删除的时间范围：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>delete from root.ln.wf02.wt02.status where time < 10 |
| delete from root.ln.wf02.wt02.status where time <= 10 |
| delete from root.ln.wf02.wt02.status where time < 20 and time > 10 |
| delete from root.ln.wf02.wt02.status where time <= 20 and time >= 10 |
| delete from root.ln.wf02.wt02.status where time > 20 |
| delete from root.ln.wf02.wt02.status where time >= 20 |
| delete from root.ln.wf02.wt02.status where time = 20 |
| </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>需要注意，当前的删除语句不支持where子句后的时间范围为多个由OR连接成的时间区间。如下删除语句将会解析出错：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>delete from root.ln.wf02.wt02.status where time > 4 or time < 0 |
| Msg: 303: Check metadata error: For delete statement, where clause can only contain atomic |
| expressions like : time > XXX, time <= XXX, or two atomic expressions connected by 'AND' |
| </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><p>如果delete语句中未指定where子句，则会删除时间序列中的所有数据。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>delete from root.ln.wf02.status |
| </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/V0.11.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><h2 id="删除时间分区-实验性功能"><a href="#删除时间分区-实验性功能" class="header-anchor">#</a> 删除时间分区 (实验性功能)</h2> <p>您可以通过如下语句来删除某一个存储组下的指定时间分区:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>DELETE PARTITION root.ln 0,1,2 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>上例中的0,1,2为待删除时间分区的id，您可以通过查看IoTDB的数据文件夹找到它，或者可以通过计算<code>timestamp / partitionInterval</code>(向下取整), |
| 手动地将一个时间戳转换为对应的id，其中的<code>partitionInterval</code>可以在IoTDB的配置文件中找到（如果您使用的版本支持时间分区）。</p> <p>请注意该功能目前只是实验性的，如果您不是开发者，使用时请务必谨慎。</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
| ← |
| <a href="/zh/UserGuide/V0.11.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/V0.11.x/Operation Manual/Administration.html"> |
| 权限管理语句 |
| </a> |
| → |
| </span></p></div> <p style="text-align: center; color: #909399; font-size: 12px">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: #909399; font-size: 12px"><strong>Have a question?</strong> Connect with us on QQ, WeChat, or Slack. <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> now.</p> <p style="text-align: center; margin-top: 10px; color: #909399; font-size: 12px"> |
| We use <a href="https://analytics.google.com">Google Analytics</a> to collect anonymous, aggregated usage information. |
| </p></main></div><div class="global-ui"></div></div> |
| <script src="/assets/js/app.b493877d.js" defer></script><script src="/assets/js/3.36f2a167.js" defer></script><script src="/assets/js/4.e8b2d372.js" defer></script><script src="/assets/js/506.2b860a4f.js" defer></script> |
| </body> |
| </html> |
