<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title> </title>
    <meta name="generator" content="VuePress 1.8.2">
    <link rel="icon" href="/favicon.ico">
    <meta name="description" content=" ">
    <meta name="Description" content="Apache IoTDB: Time Series Database for IoT">
    <meta name="Keywords" content="TSDB, time series, time series database, IoTDB, IoT database, IoT data management,时序数据库, 时间序列管理, IoTDB, 物联网数据库, 实时数据库, 物联网数据管理, 物联网数据">
    <meta name="baidu-site-verification" content="wfKETzB3OT">
    <meta name="google-site-verification" content="mZWAoRY0yj_HAr-s47zHCGHzx5Ju-RVm5wDbPnwQYFo">
    
    <link rel="preload" href="/assets/css/0.styles.76a92265.css" as="style"><link rel="preload" href="/assets/js/app.38ae92d2.js" as="script"><link rel="preload" href="/assets/js/3.9588d9cb.js" as="script"><link rel="preload" href="/assets/js/4.e8b2d372.js" as="script"><link rel="preload" href="/assets/js/283.37fc50e5.js" as="script"><link rel="prefetch" href="/assets/js/10.4edb8739.js"><link rel="prefetch" href="/assets/js/100.b2c03f2a.js"><link rel="prefetch" href="/assets/js/101.06a052bd.js"><link rel="prefetch" href="/assets/js/102.0907f33f.js"><link rel="prefetch" href="/assets/js/103.6bb6552d.js"><link rel="prefetch" href="/assets/js/104.e76aba8d.js"><link rel="prefetch" href="/assets/js/105.acece44f.js"><link rel="prefetch" href="/assets/js/106.382a3189.js"><link rel="prefetch" href="/assets/js/107.292a9aec.js"><link rel="prefetch" href="/assets/js/108.5f382ea0.js"><link rel="prefetch" href="/assets/js/109.910b5233.js"><link rel="prefetch" href="/assets/js/11.e6c21699.js"><link rel="prefetch" href="/assets/js/110.937203eb.js"><link rel="prefetch" href="/assets/js/111.2dcc4bcf.js"><link rel="prefetch" href="/assets/js/112.d8f2e77a.js"><link rel="prefetch" href="/assets/js/113.612fc102.js"><link rel="prefetch" href="/assets/js/114.8a3162ed.js"><link rel="prefetch" href="/assets/js/115.376587fd.js"><link rel="prefetch" href="/assets/js/116.0968d68f.js"><link rel="prefetch" href="/assets/js/117.14868556.js"><link rel="prefetch" href="/assets/js/118.b9358bab.js"><link rel="prefetch" href="/assets/js/119.f870b247.js"><link rel="prefetch" href="/assets/js/12.19b2cf59.js"><link rel="prefetch" href="/assets/js/120.21eb7ce6.js"><link rel="prefetch" href="/assets/js/121.7023948d.js"><link rel="prefetch" href="/assets/js/122.e55e572a.js"><link rel="prefetch" href="/assets/js/123.d80eacbc.js"><link rel="prefetch" href="/assets/js/124.bb2dff49.js"><link rel="prefetch" href="/assets/js/125.5a2de0c5.js"><link rel="prefetch" href="/assets/js/126.b68bb5dc.js"><link rel="prefetch" href="/assets/js/127.0f06edc0.js"><link rel="prefetch" href="/assets/js/128.180c6022.js"><link rel="prefetch" href="/assets/js/129.e97f8455.js"><link rel="prefetch" href="/assets/js/13.39738b97.js"><link rel="prefetch" href="/assets/js/130.839cdb12.js"><link rel="prefetch" href="/assets/js/131.46a5c253.js"><link rel="prefetch" href="/assets/js/132.fa6f1744.js"><link rel="prefetch" href="/assets/js/133.fe1acb82.js"><link rel="prefetch" href="/assets/js/134.74197446.js"><link rel="prefetch" href="/assets/js/135.1bc2844c.js"><link rel="prefetch" href="/assets/js/136.d58f1423.js"><link rel="prefetch" href="/assets/js/137.e460db3a.js"><link rel="prefetch" href="/assets/js/138.73b27c69.js"><link rel="prefetch" href="/assets/js/139.d7435a90.js"><link rel="prefetch" href="/assets/js/14.23db3473.js"><link rel="prefetch" href="/assets/js/140.daba535e.js"><link rel="prefetch" href="/assets/js/141.d2d7fe46.js"><link rel="prefetch" href="/assets/js/142.41fa7be3.js"><link rel="prefetch" href="/assets/js/143.950d5e99.js"><link rel="prefetch" href="/assets/js/144.0099a385.js"><link rel="prefetch" href="/assets/js/145.2d6f2c59.js"><link rel="prefetch" href="/assets/js/146.ca79d7b2.js"><link rel="prefetch" href="/assets/js/147.69e727d6.js"><link rel="prefetch" href="/assets/js/148.4507e735.js"><link rel="prefetch" href="/assets/js/149.39213893.js"><link rel="prefetch" href="/assets/js/15.6924f7af.js"><link rel="prefetch" href="/assets/js/150.6ae126ee.js"><link rel="prefetch" href="/assets/js/151.068c7737.js"><link rel="prefetch" href="/assets/js/152.59a55390.js"><link rel="prefetch" href="/assets/js/153.e7825d78.js"><link rel="prefetch" href="/assets/js/154.b9e34bf5.js"><link rel="prefetch" href="/assets/js/155.260bc971.js"><link rel="prefetch" href="/assets/js/156.f69ae5f5.js"><link rel="prefetch" href="/assets/js/157.22a177cf.js"><link rel="prefetch" href="/assets/js/158.0ec1c689.js"><link rel="prefetch" href="/assets/js/159.5b4c02c2.js"><link rel="prefetch" href="/assets/js/16.0394c19a.js"><link rel="prefetch" href="/assets/js/160.1d22f1e7.js"><link rel="prefetch" href="/assets/js/161.48476baf.js"><link rel="prefetch" href="/assets/js/162.35e8c970.js"><link rel="prefetch" href="/assets/js/163.236a0fb2.js"><link rel="prefetch" href="/assets/js/164.16b5aa8f.js"><link rel="prefetch" href="/assets/js/165.d0579cdb.js"><link rel="prefetch" href="/assets/js/166.774b9e77.js"><link rel="prefetch" href="/assets/js/167.fe97d42d.js"><link rel="prefetch" href="/assets/js/168.fd333af7.js"><link rel="prefetch" href="/assets/js/169.82ab810e.js"><link rel="prefetch" href="/assets/js/17.d134c9d8.js"><link rel="prefetch" href="/assets/js/170.79f5dfde.js"><link rel="prefetch" href="/assets/js/171.209d42e2.js"><link rel="prefetch" href="/assets/js/172.9ad40224.js"><link rel="prefetch" href="/assets/js/173.e8cbade4.js"><link rel="prefetch" href="/assets/js/174.6d5156cf.js"><link rel="prefetch" href="/assets/js/175.229ae8a6.js"><link rel="prefetch" href="/assets/js/176.9fe12846.js"><link rel="prefetch" href="/assets/js/177.897708b8.js"><link rel="prefetch" href="/assets/js/178.50a49516.js"><link rel="prefetch" href="/assets/js/179.b85d8323.js"><link rel="prefetch" href="/assets/js/18.01351113.js"><link rel="prefetch" href="/assets/js/180.7fd08995.js"><link rel="prefetch" href="/assets/js/181.45b74618.js"><link rel="prefetch" href="/assets/js/182.174768f9.js"><link rel="prefetch" href="/assets/js/183.12604373.js"><link rel="prefetch" href="/assets/js/184.e1ece4e4.js"><link rel="prefetch" href="/assets/js/185.4e416d91.js"><link rel="prefetch" href="/assets/js/186.be04c8a8.js"><link rel="prefetch" href="/assets/js/187.bb1b7d3b.js"><link rel="prefetch" href="/assets/js/188.db28cde0.js"><link rel="prefetch" href="/assets/js/189.02b808d9.js"><link rel="prefetch" href="/assets/js/19.94b053c3.js"><link rel="prefetch" href="/assets/js/190.26b12a71.js"><link rel="prefetch" href="/assets/js/191.3652c981.js"><link rel="prefetch" href="/assets/js/192.c0c77e29.js"><link rel="prefetch" href="/assets/js/193.7f513aa8.js"><link rel="prefetch" href="/assets/js/194.64c250d4.js"><link rel="prefetch" href="/assets/js/195.b61eddfb.js"><link rel="prefetch" href="/assets/js/196.6d4921e0.js"><link rel="prefetch" href="/assets/js/197.fdb9d304.js"><link rel="prefetch" href="/assets/js/198.d7d53c65.js"><link rel="prefetch" href="/assets/js/199.d3140bd9.js"><link rel="prefetch" href="/assets/js/20.9bdb2486.js"><link rel="prefetch" href="/assets/js/200.4e47ea34.js"><link rel="prefetch" href="/assets/js/201.004e26b2.js"><link rel="prefetch" href="/assets/js/202.026014a6.js"><link rel="prefetch" href="/assets/js/203.2467f5b1.js"><link rel="prefetch" href="/assets/js/204.a435a4df.js"><link rel="prefetch" href="/assets/js/205.6dc7aca1.js"><link rel="prefetch" href="/assets/js/206.6a7a9846.js"><link rel="prefetch" href="/assets/js/207.d407c7fd.js"><link rel="prefetch" href="/assets/js/208.a2c33fb5.js"><link rel="prefetch" href="/assets/js/209.4a69166c.js"><link rel="prefetch" href="/assets/js/21.e257b311.js"><link rel="prefetch" href="/assets/js/210.356f66e4.js"><link rel="prefetch" href="/assets/js/211.0ed0ee5c.js"><link rel="prefetch" href="/assets/js/212.ac3a3e0c.js"><link rel="prefetch" href="/assets/js/213.d3125063.js"><link rel="prefetch" href="/assets/js/214.fe9920a3.js"><link rel="prefetch" href="/assets/js/215.df26a0f5.js"><link rel="prefetch" href="/assets/js/216.2d793d95.js"><link rel="prefetch" href="/assets/js/217.b27c9d90.js"><link rel="prefetch" href="/assets/js/218.84093362.js"><link rel="prefetch" href="/assets/js/219.e0b6e89f.js"><link rel="prefetch" href="/assets/js/22.15bc349b.js"><link rel="prefetch" href="/assets/js/220.8cd5bcc0.js"><link rel="prefetch" href="/assets/js/221.158960d6.js"><link rel="prefetch" href="/assets/js/222.c2c8485c.js"><link rel="prefetch" href="/assets/js/223.119210d7.js"><link rel="prefetch" href="/assets/js/224.8357099c.js"><link rel="prefetch" href="/assets/js/225.8e211b07.js"><link rel="prefetch" href="/assets/js/226.32750008.js"><link rel="prefetch" href="/assets/js/227.0d29f54f.js"><link rel="prefetch" href="/assets/js/228.0d88412b.js"><link rel="prefetch" href="/assets/js/229.32e940ae.js"><link rel="prefetch" href="/assets/js/23.356725e7.js"><link rel="prefetch" href="/assets/js/230.5bc3a942.js"><link rel="prefetch" href="/assets/js/231.3364a6d9.js"><link rel="prefetch" href="/assets/js/232.b4bd9a55.js"><link rel="prefetch" href="/assets/js/233.662dba8a.js"><link rel="prefetch" href="/assets/js/234.e5251f95.js"><link rel="prefetch" href="/assets/js/235.68ed9179.js"><link rel="prefetch" href="/assets/js/236.c3059b58.js"><link rel="prefetch" href="/assets/js/237.e9553f0d.js"><link rel="prefetch" href="/assets/js/238.b04f07fd.js"><link rel="prefetch" href="/assets/js/239.6da5c91d.js"><link rel="prefetch" href="/assets/js/24.55650a81.js"><link rel="prefetch" href="/assets/js/240.6b37e6f2.js"><link rel="prefetch" href="/assets/js/241.0abd9eda.js"><link rel="prefetch" href="/assets/js/242.80bebdd8.js"><link rel="prefetch" href="/assets/js/243.c6518b1b.js"><link rel="prefetch" href="/assets/js/244.ab6c5fc1.js"><link rel="prefetch" href="/assets/js/245.17ccc0dd.js"><link rel="prefetch" href="/assets/js/246.ba50479b.js"><link rel="prefetch" href="/assets/js/247.86115376.js"><link rel="prefetch" href="/assets/js/248.8a7c8f12.js"><link rel="prefetch" href="/assets/js/249.048ba6c0.js"><link rel="prefetch" href="/assets/js/25.f9d584fe.js"><link rel="prefetch" href="/assets/js/250.9cd7941b.js"><link rel="prefetch" href="/assets/js/251.3c39902e.js"><link rel="prefetch" href="/assets/js/252.2a9b33ae.js"><link rel="prefetch" href="/assets/js/253.522e3e3c.js"><link rel="prefetch" href="/assets/js/254.13053759.js"><link rel="prefetch" href="/assets/js/255.39d8b75b.js"><link rel="prefetch" href="/assets/js/256.75086add.js"><link rel="prefetch" href="/assets/js/257.4ac3de21.js"><link rel="prefetch" href="/assets/js/258.6280be10.js"><link rel="prefetch" href="/assets/js/259.540f25d7.js"><link rel="prefetch" href="/assets/js/26.c8060b33.js"><link rel="prefetch" href="/assets/js/260.8b452b01.js"><link rel="prefetch" href="/assets/js/261.7cec6038.js"><link rel="prefetch" href="/assets/js/262.a3a018d6.js"><link rel="prefetch" href="/assets/js/263.4f6b32e5.js"><link rel="prefetch" href="/assets/js/264.ab83d508.js"><link rel="prefetch" href="/assets/js/265.4f3fcd84.js"><link rel="prefetch" href="/assets/js/266.bccaee86.js"><link rel="prefetch" href="/assets/js/267.1aab7797.js"><link rel="prefetch" href="/assets/js/268.2b7ce8ea.js"><link rel="prefetch" href="/assets/js/269.4d710d73.js"><link rel="prefetch" href="/assets/js/27.70f7dc1a.js"><link rel="prefetch" href="/assets/js/270.065b737e.js"><link rel="prefetch" href="/assets/js/271.785a9085.js"><link rel="prefetch" href="/assets/js/272.7cbb8af3.js"><link rel="prefetch" href="/assets/js/273.2704f7e3.js"><link rel="prefetch" href="/assets/js/274.1f01ec24.js"><link rel="prefetch" href="/assets/js/275.4150d000.js"><link rel="prefetch" href="/assets/js/276.69f9e834.js"><link rel="prefetch" href="/assets/js/277.90223a51.js"><link rel="prefetch" href="/assets/js/278.951b6be1.js"><link rel="prefetch" href="/assets/js/279.1c8de1e0.js"><link rel="prefetch" href="/assets/js/28.9533e2e5.js"><link rel="prefetch" href="/assets/js/280.f6e8f6d1.js"><link rel="prefetch" href="/assets/js/281.2f95dc07.js"><link rel="prefetch" href="/assets/js/282.4ee881f8.js"><link rel="prefetch" href="/assets/js/284.169d383a.js"><link rel="prefetch" href="/assets/js/285.6399c745.js"><link rel="prefetch" href="/assets/js/286.6b59fb7d.js"><link rel="prefetch" href="/assets/js/287.c56f7823.js"><link rel="prefetch" href="/assets/js/288.30a44ee4.js"><link rel="prefetch" href="/assets/js/289.a1096ef1.js"><link rel="prefetch" href="/assets/js/29.430f946b.js"><link rel="prefetch" href="/assets/js/290.6fdc61b9.js"><link rel="prefetch" href="/assets/js/291.bb1fd8ca.js"><link rel="prefetch" href="/assets/js/292.16654a32.js"><link rel="prefetch" href="/assets/js/293.b6d20d1a.js"><link rel="prefetch" href="/assets/js/294.982567db.js"><link rel="prefetch" href="/assets/js/295.6e59e100.js"><link rel="prefetch" href="/assets/js/296.c2d8ad94.js"><link rel="prefetch" href="/assets/js/297.dff911c3.js"><link rel="prefetch" href="/assets/js/298.44d30f5b.js"><link rel="prefetch" href="/assets/js/299.e77a794b.js"><link rel="prefetch" href="/assets/js/30.fe2c1084.js"><link rel="prefetch" href="/assets/js/300.4e2a12c2.js"><link rel="prefetch" href="/assets/js/301.6caf819b.js"><link rel="prefetch" href="/assets/js/302.1a4e8408.js"><link rel="prefetch" href="/assets/js/303.f4b9d38a.js"><link rel="prefetch" href="/assets/js/304.b9a72907.js"><link rel="prefetch" href="/assets/js/305.3e51e06a.js"><link rel="prefetch" href="/assets/js/306.fde8e0ba.js"><link rel="prefetch" href="/assets/js/307.9ddf5f9d.js"><link rel="prefetch" href="/assets/js/308.8862b104.js"><link rel="prefetch" href="/assets/js/309.335f24b7.js"><link rel="prefetch" href="/assets/js/31.abfdfce0.js"><link rel="prefetch" href="/assets/js/310.c7ff003b.js"><link rel="prefetch" href="/assets/js/311.e9d5a6d5.js"><link rel="prefetch" href="/assets/js/312.a5eeea9d.js"><link rel="prefetch" href="/assets/js/313.ff0db688.js"><link rel="prefetch" href="/assets/js/314.cb57bc8f.js"><link rel="prefetch" href="/assets/js/315.ef2f1e1c.js"><link rel="prefetch" href="/assets/js/316.b64b7edf.js"><link rel="prefetch" href="/assets/js/317.cd337490.js"><link rel="prefetch" href="/assets/js/318.19068beb.js"><link rel="prefetch" href="/assets/js/319.ac55458d.js"><link rel="prefetch" href="/assets/js/32.a681396b.js"><link rel="prefetch" href="/assets/js/320.0680b555.js"><link rel="prefetch" href="/assets/js/321.24f393a7.js"><link rel="prefetch" href="/assets/js/322.4919119d.js"><link rel="prefetch" href="/assets/js/323.da8aad7d.js"><link rel="prefetch" href="/assets/js/324.433566fb.js"><link rel="prefetch" href="/assets/js/325.9c71368e.js"><link rel="prefetch" href="/assets/js/326.1705b8d6.js"><link rel="prefetch" href="/assets/js/327.f956cfb3.js"><link rel="prefetch" href="/assets/js/328.71d993e9.js"><link rel="prefetch" href="/assets/js/329.f2b006e4.js"><link rel="prefetch" href="/assets/js/33.cd506774.js"><link rel="prefetch" href="/assets/js/330.4d907148.js"><link rel="prefetch" href="/assets/js/331.5525e594.js"><link rel="prefetch" href="/assets/js/332.02bb2d02.js"><link rel="prefetch" href="/assets/js/333.bb6398f7.js"><link rel="prefetch" href="/assets/js/334.eb2a4b5e.js"><link rel="prefetch" href="/assets/js/335.0ec01795.js"><link rel="prefetch" href="/assets/js/336.ff287293.js"><link rel="prefetch" href="/assets/js/337.6413381a.js"><link rel="prefetch" href="/assets/js/338.900b5b43.js"><link rel="prefetch" href="/assets/js/339.01afaa03.js"><link rel="prefetch" href="/assets/js/34.775b5d79.js"><link rel="prefetch" href="/assets/js/340.cbf165eb.js"><link rel="prefetch" href="/assets/js/341.bdb0b7c4.js"><link rel="prefetch" href="/assets/js/342.0b2a481b.js"><link rel="prefetch" href="/assets/js/343.e3e7d460.js"><link rel="prefetch" href="/assets/js/344.51304626.js"><link rel="prefetch" href="/assets/js/345.732588b5.js"><link rel="prefetch" href="/assets/js/346.7018618f.js"><link rel="prefetch" href="/assets/js/347.5abc29de.js"><link rel="prefetch" href="/assets/js/348.99790f23.js"><link rel="prefetch" href="/assets/js/349.35ce0487.js"><link rel="prefetch" href="/assets/js/35.7aabeb16.js"><link rel="prefetch" href="/assets/js/350.fc167b3a.js"><link rel="prefetch" href="/assets/js/351.2ccd664b.js"><link rel="prefetch" href="/assets/js/352.3e20f465.js"><link rel="prefetch" href="/assets/js/353.bbb89eaa.js"><link rel="prefetch" href="/assets/js/354.2d795071.js"><link rel="prefetch" href="/assets/js/355.5c59a441.js"><link rel="prefetch" href="/assets/js/356.702b6d97.js"><link rel="prefetch" href="/assets/js/357.b588678d.js"><link rel="prefetch" href="/assets/js/358.4ab7126c.js"><link rel="prefetch" href="/assets/js/359.aeb81810.js"><link rel="prefetch" href="/assets/js/36.d3c0f58a.js"><link rel="prefetch" href="/assets/js/360.207afa8e.js"><link rel="prefetch" href="/assets/js/361.79434f70.js"><link rel="prefetch" href="/assets/js/362.c77c073e.js"><link rel="prefetch" href="/assets/js/363.90eec240.js"><link rel="prefetch" href="/assets/js/364.eab7e1e4.js"><link rel="prefetch" href="/assets/js/365.8202bb25.js"><link rel="prefetch" href="/assets/js/366.58b1c0c4.js"><link rel="prefetch" href="/assets/js/367.b85a36a6.js"><link rel="prefetch" href="/assets/js/368.b92f91e9.js"><link rel="prefetch" href="/assets/js/369.04a3e9d0.js"><link rel="prefetch" href="/assets/js/37.92bd0a0a.js"><link rel="prefetch" href="/assets/js/370.2b491137.js"><link rel="prefetch" href="/assets/js/371.91a9253e.js"><link rel="prefetch" href="/assets/js/372.345a366f.js"><link rel="prefetch" href="/assets/js/373.3bd2835b.js"><link rel="prefetch" href="/assets/js/374.901fae16.js"><link rel="prefetch" href="/assets/js/375.9738f205.js"><link rel="prefetch" href="/assets/js/376.5485c163.js"><link rel="prefetch" href="/assets/js/377.fc74cb27.js"><link rel="prefetch" href="/assets/js/378.fc5a69bc.js"><link rel="prefetch" href="/assets/js/379.74d1a937.js"><link rel="prefetch" href="/assets/js/38.74abcde8.js"><link rel="prefetch" href="/assets/js/380.7a6a6236.js"><link rel="prefetch" href="/assets/js/381.c0a999f0.js"><link rel="prefetch" href="/assets/js/382.7fcaa731.js"><link rel="prefetch" href="/assets/js/383.ad2de414.js"><link rel="prefetch" href="/assets/js/384.d6312479.js"><link rel="prefetch" href="/assets/js/385.e3199ce8.js"><link rel="prefetch" href="/assets/js/386.026f90f6.js"><link rel="prefetch" href="/assets/js/387.f0ab7a1e.js"><link rel="prefetch" href="/assets/js/388.56fb1b90.js"><link rel="prefetch" href="/assets/js/389.ec93bf08.js"><link rel="prefetch" href="/assets/js/39.1728ceb9.js"><link rel="prefetch" href="/assets/js/390.1c51f967.js"><link rel="prefetch" href="/assets/js/391.6d209fc4.js"><link rel="prefetch" href="/assets/js/392.345e07e1.js"><link rel="prefetch" href="/assets/js/393.d64c12b3.js"><link rel="prefetch" href="/assets/js/394.0558c1ad.js"><link rel="prefetch" href="/assets/js/395.3714f64a.js"><link rel="prefetch" href="/assets/js/396.2bfaa24c.js"><link rel="prefetch" href="/assets/js/397.0e54a534.js"><link rel="prefetch" href="/assets/js/398.2cb036e2.js"><link rel="prefetch" href="/assets/js/399.3b72a52a.js"><link rel="prefetch" href="/assets/js/40.1f714478.js"><link rel="prefetch" href="/assets/js/400.be59c086.js"><link rel="prefetch" href="/assets/js/401.2da8dbb1.js"><link rel="prefetch" href="/assets/js/402.1921c30c.js"><link rel="prefetch" href="/assets/js/403.7c1c384a.js"><link rel="prefetch" href="/assets/js/404.dfdaed6a.js"><link rel="prefetch" href="/assets/js/405.35b32262.js"><link rel="prefetch" href="/assets/js/406.33cbd363.js"><link rel="prefetch" href="/assets/js/407.38e56ed9.js"><link rel="prefetch" href="/assets/js/408.8f65f1a9.js"><link rel="prefetch" href="/assets/js/409.58ba4e51.js"><link rel="prefetch" href="/assets/js/41.0c2b254b.js"><link rel="prefetch" href="/assets/js/410.85e37fb0.js"><link rel="prefetch" href="/assets/js/411.16c85132.js"><link rel="prefetch" href="/assets/js/412.35a00b5a.js"><link rel="prefetch" href="/assets/js/413.5f9161e1.js"><link rel="prefetch" href="/assets/js/414.46d25412.js"><link rel="prefetch" href="/assets/js/415.6ce6ad34.js"><link rel="prefetch" href="/assets/js/416.3ccc9763.js"><link rel="prefetch" href="/assets/js/417.1acd33fa.js"><link rel="prefetch" href="/assets/js/418.6dbcc2e7.js"><link rel="prefetch" href="/assets/js/419.d3ef613c.js"><link rel="prefetch" href="/assets/js/42.074c8c80.js"><link rel="prefetch" href="/assets/js/420.b4714395.js"><link rel="prefetch" href="/assets/js/421.21d248db.js"><link rel="prefetch" href="/assets/js/422.44875cda.js"><link rel="prefetch" href="/assets/js/423.d51e4b03.js"><link rel="prefetch" href="/assets/js/424.729f6504.js"><link rel="prefetch" href="/assets/js/425.99cfe92f.js"><link rel="prefetch" href="/assets/js/426.f15ef910.js"><link rel="prefetch" href="/assets/js/427.07f84c83.js"><link rel="prefetch" href="/assets/js/428.6800c2b1.js"><link rel="prefetch" href="/assets/js/429.86601756.js"><link rel="prefetch" href="/assets/js/43.530ad2c0.js"><link rel="prefetch" href="/assets/js/430.86f948f8.js"><link rel="prefetch" href="/assets/js/431.85f93e67.js"><link rel="prefetch" href="/assets/js/432.2082599e.js"><link rel="prefetch" href="/assets/js/433.f78187eb.js"><link rel="prefetch" href="/assets/js/434.9d634993.js"><link rel="prefetch" href="/assets/js/435.8b148a82.js"><link rel="prefetch" href="/assets/js/436.1f1d604e.js"><link rel="prefetch" href="/assets/js/437.3ec7f11e.js"><link rel="prefetch" href="/assets/js/438.7debb5b8.js"><link rel="prefetch" href="/assets/js/439.a6bf40ff.js"><link rel="prefetch" href="/assets/js/44.7dc61f19.js"><link rel="prefetch" href="/assets/js/440.7d8c3482.js"><link rel="prefetch" href="/assets/js/441.75d928e5.js"><link rel="prefetch" href="/assets/js/442.f7f8031f.js"><link rel="prefetch" href="/assets/js/443.bd413509.js"><link rel="prefetch" href="/assets/js/444.e415802d.js"><link rel="prefetch" href="/assets/js/445.0cd152dd.js"><link rel="prefetch" href="/assets/js/446.9c87030b.js"><link rel="prefetch" href="/assets/js/447.04c0b2a5.js"><link rel="prefetch" href="/assets/js/448.9099b530.js"><link rel="prefetch" href="/assets/js/449.b5abefdf.js"><link rel="prefetch" href="/assets/js/45.389e69ae.js"><link rel="prefetch" href="/assets/js/450.9c92e45e.js"><link rel="prefetch" href="/assets/js/451.88741426.js"><link rel="prefetch" href="/assets/js/452.38a4521b.js"><link rel="prefetch" href="/assets/js/453.6c555287.js"><link rel="prefetch" href="/assets/js/454.d22aa1ba.js"><link rel="prefetch" href="/assets/js/455.d454ae8f.js"><link rel="prefetch" href="/assets/js/456.869e4ab6.js"><link rel="prefetch" href="/assets/js/457.acd9086e.js"><link rel="prefetch" href="/assets/js/458.6112897d.js"><link rel="prefetch" href="/assets/js/459.ff4fde42.js"><link rel="prefetch" href="/assets/js/46.331ddc9e.js"><link rel="prefetch" href="/assets/js/460.821db9fb.js"><link rel="prefetch" href="/assets/js/461.3f2d3f18.js"><link rel="prefetch" href="/assets/js/462.051f2418.js"><link rel="prefetch" href="/assets/js/463.8bb2894a.js"><link rel="prefetch" href="/assets/js/464.d0c458f5.js"><link rel="prefetch" href="/assets/js/465.4920428c.js"><link rel="prefetch" href="/assets/js/466.5368e9dd.js"><link rel="prefetch" href="/assets/js/467.81b01c6a.js"><link rel="prefetch" href="/assets/js/468.95e4a5c3.js"><link rel="prefetch" href="/assets/js/469.14ceeb5a.js"><link rel="prefetch" href="/assets/js/47.a80149ec.js"><link rel="prefetch" href="/assets/js/470.cb1659ec.js"><link rel="prefetch" href="/assets/js/471.c6dfc784.js"><link rel="prefetch" href="/assets/js/472.3aaa352a.js"><link rel="prefetch" href="/assets/js/473.23316bfe.js"><link rel="prefetch" href="/assets/js/474.d444b477.js"><link rel="prefetch" href="/assets/js/475.28239a7d.js"><link rel="prefetch" href="/assets/js/476.11b4b2c1.js"><link rel="prefetch" href="/assets/js/477.e8b046d2.js"><link rel="prefetch" href="/assets/js/478.f4aa5de1.js"><link rel="prefetch" href="/assets/js/479.ca5b8064.js"><link rel="prefetch" href="/assets/js/48.a96093b7.js"><link rel="prefetch" href="/assets/js/480.74f70b5d.js"><link rel="prefetch" href="/assets/js/481.9304f706.js"><link rel="prefetch" href="/assets/js/482.aa4641a2.js"><link rel="prefetch" href="/assets/js/483.6e5a5ba3.js"><link rel="prefetch" href="/assets/js/484.7861f3dc.js"><link rel="prefetch" href="/assets/js/485.9f7473aa.js"><link rel="prefetch" href="/assets/js/486.39308b88.js"><link rel="prefetch" href="/assets/js/487.b5b54239.js"><link rel="prefetch" href="/assets/js/488.0daa5a9a.js"><link rel="prefetch" href="/assets/js/489.91b858f7.js"><link rel="prefetch" href="/assets/js/49.01ba53c4.js"><link rel="prefetch" href="/assets/js/490.c1c3e018.js"><link rel="prefetch" href="/assets/js/491.f255141e.js"><link rel="prefetch" href="/assets/js/492.c8705eaa.js"><link rel="prefetch" href="/assets/js/493.3cf38aaa.js"><link rel="prefetch" href="/assets/js/494.a79e981a.js"><link rel="prefetch" href="/assets/js/495.ef94838d.js"><link rel="prefetch" href="/assets/js/496.633011e1.js"><link rel="prefetch" href="/assets/js/497.fbcae06b.js"><link rel="prefetch" href="/assets/js/498.36690440.js"><link rel="prefetch" href="/assets/js/499.f54a6ad9.js"><link rel="prefetch" href="/assets/js/5.eace4687.js"><link rel="prefetch" href="/assets/js/50.999f0cbb.js"><link rel="prefetch" href="/assets/js/500.46d71f73.js"><link rel="prefetch" href="/assets/js/501.04336cfa.js"><link rel="prefetch" href="/assets/js/502.8ef1a647.js"><link rel="prefetch" href="/assets/js/503.df4d1cb2.js"><link rel="prefetch" href="/assets/js/504.989dfdb0.js"><link rel="prefetch" href="/assets/js/505.fd51a969.js"><link rel="prefetch" href="/assets/js/506.0bf882f9.js"><link rel="prefetch" href="/assets/js/507.36f1a611.js"><link rel="prefetch" href="/assets/js/508.44208ef6.js"><link rel="prefetch" href="/assets/js/509.f4b70cf0.js"><link rel="prefetch" href="/assets/js/51.23e52d62.js"><link rel="prefetch" href="/assets/js/510.e4f2e0a1.js"><link rel="prefetch" href="/assets/js/511.632b52c7.js"><link rel="prefetch" href="/assets/js/512.d1e7d4e6.js"><link rel="prefetch" href="/assets/js/513.e0d72a15.js"><link rel="prefetch" href="/assets/js/514.9a6d0839.js"><link rel="prefetch" href="/assets/js/515.097379fe.js"><link rel="prefetch" href="/assets/js/516.3e137eba.js"><link rel="prefetch" href="/assets/js/517.85975bd0.js"><link rel="prefetch" href="/assets/js/518.f013e477.js"><link rel="prefetch" href="/assets/js/519.af730a32.js"><link rel="prefetch" href="/assets/js/52.511d75cd.js"><link rel="prefetch" href="/assets/js/520.ebeafc14.js"><link rel="prefetch" href="/assets/js/521.0e1fa632.js"><link rel="prefetch" href="/assets/js/522.c36de35e.js"><link rel="prefetch" href="/assets/js/523.99cfc53a.js"><link rel="prefetch" href="/assets/js/524.d503889d.js"><link rel="prefetch" href="/assets/js/525.b8261ba8.js"><link rel="prefetch" href="/assets/js/526.5d12978f.js"><link rel="prefetch" href="/assets/js/527.4c44a8e3.js"><link rel="prefetch" href="/assets/js/528.e787e409.js"><link rel="prefetch" href="/assets/js/529.11b07638.js"><link rel="prefetch" href="/assets/js/53.0e2c8125.js"><link rel="prefetch" href="/assets/js/530.3ed09f23.js"><link rel="prefetch" href="/assets/js/531.5a116099.js"><link rel="prefetch" href="/assets/js/532.85cac22c.js"><link rel="prefetch" href="/assets/js/533.5e740aba.js"><link rel="prefetch" href="/assets/js/534.e1efd7b4.js"><link rel="prefetch" href="/assets/js/535.eb0ce578.js"><link rel="prefetch" href="/assets/js/536.e13b6737.js"><link rel="prefetch" href="/assets/js/537.0db5794e.js"><link rel="prefetch" href="/assets/js/538.bc1655cf.js"><link rel="prefetch" href="/assets/js/539.6eaa01a3.js"><link rel="prefetch" href="/assets/js/54.ec0b069c.js"><link rel="prefetch" href="/assets/js/540.a3e02cb6.js"><link rel="prefetch" href="/assets/js/541.26284e92.js"><link rel="prefetch" href="/assets/js/542.f3c261fc.js"><link rel="prefetch" href="/assets/js/543.ce0b8bc5.js"><link rel="prefetch" href="/assets/js/544.1dede601.js"><link rel="prefetch" href="/assets/js/545.4b6ed6aa.js"><link rel="prefetch" href="/assets/js/546.94f5de81.js"><link rel="prefetch" href="/assets/js/547.7341436c.js"><link rel="prefetch" href="/assets/js/548.7b4cf0b6.js"><link rel="prefetch" href="/assets/js/549.b63b44c9.js"><link rel="prefetch" href="/assets/js/55.a1e34c52.js"><link rel="prefetch" href="/assets/js/550.6d5ef23a.js"><link rel="prefetch" href="/assets/js/551.2b59b742.js"><link rel="prefetch" href="/assets/js/552.07db9743.js"><link rel="prefetch" href="/assets/js/553.ab0ec154.js"><link rel="prefetch" href="/assets/js/554.9e21ca43.js"><link rel="prefetch" href="/assets/js/555.a7631938.js"><link rel="prefetch" href="/assets/js/556.1b31e8db.js"><link rel="prefetch" href="/assets/js/557.b63c81ad.js"><link rel="prefetch" href="/assets/js/558.ef9cfc6f.js"><link rel="prefetch" href="/assets/js/559.decaa9fa.js"><link rel="prefetch" href="/assets/js/56.3972fd13.js"><link rel="prefetch" href="/assets/js/560.9f3f34b9.js"><link rel="prefetch" href="/assets/js/561.59b527cb.js"><link rel="prefetch" href="/assets/js/562.b7d85dbb.js"><link rel="prefetch" href="/assets/js/563.2c532df6.js"><link rel="prefetch" href="/assets/js/564.93fcab73.js"><link rel="prefetch" href="/assets/js/565.4baf3784.js"><link rel="prefetch" href="/assets/js/566.40ec7f15.js"><link rel="prefetch" href="/assets/js/567.6abeef0e.js"><link rel="prefetch" href="/assets/js/568.6bf8225c.js"><link rel="prefetch" href="/assets/js/569.5d2b41bf.js"><link rel="prefetch" href="/assets/js/57.d048b852.js"><link rel="prefetch" href="/assets/js/570.b40063ed.js"><link rel="prefetch" href="/assets/js/571.41746f8a.js"><link rel="prefetch" href="/assets/js/572.1eb39216.js"><link rel="prefetch" href="/assets/js/573.2a7779ad.js"><link rel="prefetch" href="/assets/js/574.f08b4062.js"><link rel="prefetch" href="/assets/js/575.e72955dc.js"><link rel="prefetch" href="/assets/js/576.9e012e00.js"><link rel="prefetch" href="/assets/js/577.a9756656.js"><link rel="prefetch" href="/assets/js/578.f3c0e60f.js"><link rel="prefetch" href="/assets/js/579.cb1a78e4.js"><link rel="prefetch" href="/assets/js/58.d7adf723.js"><link rel="prefetch" href="/assets/js/580.bed3a4db.js"><link rel="prefetch" href="/assets/js/581.e67ec943.js"><link rel="prefetch" href="/assets/js/582.494a2d92.js"><link rel="prefetch" href="/assets/js/583.ced25dd4.js"><link rel="prefetch" href="/assets/js/584.317631f6.js"><link rel="prefetch" href="/assets/js/585.42f1a2dd.js"><link rel="prefetch" href="/assets/js/586.db13f96e.js"><link rel="prefetch" href="/assets/js/587.f5f33272.js"><link rel="prefetch" href="/assets/js/588.e6acd445.js"><link rel="prefetch" href="/assets/js/589.8f66fd9a.js"><link rel="prefetch" href="/assets/js/59.ccc1b334.js"><link rel="prefetch" href="/assets/js/590.8fe66dec.js"><link rel="prefetch" href="/assets/js/591.1a20f18e.js"><link rel="prefetch" href="/assets/js/592.f85a4977.js"><link rel="prefetch" href="/assets/js/593.8b96e837.js"><link rel="prefetch" href="/assets/js/594.913e768f.js"><link rel="prefetch" href="/assets/js/595.91c91388.js"><link rel="prefetch" href="/assets/js/596.6ab4e25e.js"><link rel="prefetch" href="/assets/js/597.b354cc5b.js"><link rel="prefetch" href="/assets/js/598.e97a716b.js"><link rel="prefetch" href="/assets/js/599.11927d65.js"><link rel="prefetch" href="/assets/js/6.008dd0d6.js"><link rel="prefetch" href="/assets/js/60.e3e06038.js"><link rel="prefetch" href="/assets/js/600.356d782b.js"><link rel="prefetch" href="/assets/js/601.c8991755.js"><link rel="prefetch" href="/assets/js/602.0934ccc4.js"><link rel="prefetch" href="/assets/js/603.7e7b7de1.js"><link rel="prefetch" href="/assets/js/604.9c568d52.js"><link rel="prefetch" href="/assets/js/605.93982b70.js"><link rel="prefetch" href="/assets/js/606.d27b2a77.js"><link rel="prefetch" href="/assets/js/607.4ed57b58.js"><link rel="prefetch" href="/assets/js/608.ceda733e.js"><link rel="prefetch" href="/assets/js/609.fd9adef7.js"><link rel="prefetch" href="/assets/js/61.fe548a4b.js"><link rel="prefetch" href="/assets/js/610.619172db.js"><link rel="prefetch" href="/assets/js/611.aadb500d.js"><link rel="prefetch" href="/assets/js/612.9aa2acab.js"><link rel="prefetch" href="/assets/js/613.b1cfbf9c.js"><link rel="prefetch" href="/assets/js/614.f243cd21.js"><link rel="prefetch" href="/assets/js/615.4c9e19f6.js"><link rel="prefetch" href="/assets/js/616.6fbf2d17.js"><link rel="prefetch" href="/assets/js/617.3e64c225.js"><link rel="prefetch" href="/assets/js/618.e1e77dbc.js"><link rel="prefetch" href="/assets/js/619.989a61dd.js"><link rel="prefetch" href="/assets/js/62.3de0bc0b.js"><link rel="prefetch" href="/assets/js/620.c7d354b1.js"><link rel="prefetch" href="/assets/js/621.c821654f.js"><link rel="prefetch" href="/assets/js/622.0ecfa75f.js"><link rel="prefetch" href="/assets/js/623.d1ad3fa9.js"><link rel="prefetch" href="/assets/js/624.4a23f7b7.js"><link rel="prefetch" href="/assets/js/625.464d6e7b.js"><link rel="prefetch" href="/assets/js/626.078b27c6.js"><link rel="prefetch" href="/assets/js/627.ef412b20.js"><link rel="prefetch" href="/assets/js/628.23806b96.js"><link rel="prefetch" href="/assets/js/629.6e383535.js"><link rel="prefetch" href="/assets/js/63.6a72c9b4.js"><link rel="prefetch" href="/assets/js/630.5b2a36cf.js"><link rel="prefetch" href="/assets/js/631.224beb27.js"><link rel="prefetch" href="/assets/js/632.31c4ce33.js"><link rel="prefetch" href="/assets/js/633.e7884efd.js"><link rel="prefetch" href="/assets/js/634.fcd04293.js"><link rel="prefetch" href="/assets/js/635.219a574a.js"><link rel="prefetch" href="/assets/js/636.79566afe.js"><link rel="prefetch" href="/assets/js/637.1188a8aa.js"><link rel="prefetch" href="/assets/js/638.56aa8906.js"><link rel="prefetch" href="/assets/js/639.2469f290.js"><link rel="prefetch" href="/assets/js/64.f6db9f0b.js"><link rel="prefetch" href="/assets/js/640.1e5a1565.js"><link rel="prefetch" href="/assets/js/641.6b6fda8d.js"><link rel="prefetch" href="/assets/js/642.bfc89229.js"><link rel="prefetch" href="/assets/js/643.34c41390.js"><link rel="prefetch" href="/assets/js/644.bbe9e2da.js"><link rel="prefetch" href="/assets/js/645.b4cfa51b.js"><link rel="prefetch" href="/assets/js/646.4000991d.js"><link rel="prefetch" href="/assets/js/647.75146c09.js"><link rel="prefetch" href="/assets/js/648.91bad95d.js"><link rel="prefetch" href="/assets/js/649.451ac94c.js"><link rel="prefetch" href="/assets/js/65.da6f3ed4.js"><link rel="prefetch" href="/assets/js/66.88015a24.js"><link rel="prefetch" href="/assets/js/67.2373e301.js"><link rel="prefetch" href="/assets/js/68.37f7fd3f.js"><link rel="prefetch" href="/assets/js/69.3c99b115.js"><link rel="prefetch" href="/assets/js/7.8b0df68c.js"><link rel="prefetch" href="/assets/js/70.b40c143e.js"><link rel="prefetch" href="/assets/js/71.c6883392.js"><link rel="prefetch" href="/assets/js/72.59246693.js"><link rel="prefetch" href="/assets/js/73.7cc91bc6.js"><link rel="prefetch" href="/assets/js/74.2ae4d507.js"><link rel="prefetch" href="/assets/js/75.680cc48f.js"><link rel="prefetch" href="/assets/js/76.4fdc6764.js"><link rel="prefetch" href="/assets/js/77.dc2e0214.js"><link rel="prefetch" href="/assets/js/78.90a14fa1.js"><link rel="prefetch" href="/assets/js/79.c2863df3.js"><link rel="prefetch" href="/assets/js/8.9dde7893.js"><link rel="prefetch" href="/assets/js/80.92ba339e.js"><link rel="prefetch" href="/assets/js/81.560afe16.js"><link rel="prefetch" href="/assets/js/82.f463f105.js"><link rel="prefetch" href="/assets/js/83.c0fbe59c.js"><link rel="prefetch" href="/assets/js/84.3dd19c62.js"><link rel="prefetch" href="/assets/js/85.67877294.js"><link rel="prefetch" href="/assets/js/86.2d05e0bc.js"><link rel="prefetch" href="/assets/js/87.d19deb98.js"><link rel="prefetch" href="/assets/js/88.4daf3e9f.js"><link rel="prefetch" href="/assets/js/89.07f5eb68.js"><link rel="prefetch" href="/assets/js/9.15e59c54.js"><link rel="prefetch" href="/assets/js/90.bd60284d.js"><link rel="prefetch" href="/assets/js/91.95e14f25.js"><link rel="prefetch" href="/assets/js/92.33463599.js"><link rel="prefetch" href="/assets/js/93.8bd445ee.js"><link rel="prefetch" href="/assets/js/94.0d0a40c6.js"><link rel="prefetch" href="/assets/js/95.00804168.js"><link rel="prefetch" href="/assets/js/96.532eb742.js"><link rel="prefetch" href="/assets/js/97.b8cadef5.js"><link rel="prefetch" href="/assets/js/98.7200f506.js"><link rel="prefetch" href="/assets/js/99.56e7e53b.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.1288603f.js">
    <link rel="stylesheet" href="/assets/css/0.styles.76a92265.css">
  </head>
  <body>
    <div id="app" data-server-rendered="true"><div class="theme-container"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/" class="home-link router-link-active"><img src="/img/logo.png" alt=" " class="logo"></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Document</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/QuickStart/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.12.x/QuickStart/QuickStart.html" class="nav-link">V0.12.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.8.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.8.x</a></li></ul></div></div><div class="nav-item"><a href="/SystemDesign/Architecture/Architecture.html" class="nav-link">System design</a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external">
  Wiki
  <!----></a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Project Committers.html" class="nav-link">People</a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Powered By.html" class="nav-link">Powered By</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">Resources</a></li><li class="dropdown-item"><!----> <a href="/Community/Feedback.html" class="nav-link">Feedback</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Development</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Development/VoteRelease.html" class="nav-link">How to vote</a></li><li class="dropdown-item"><!----> <a href="/Development/HowToCommit.html" class="nav-link">How to Commit</a></li><li class="dropdown-item"><!----> <a href="/Development/Committer.html" class="nav-link">Become a Committer</a></li><li class="dropdown-item"><!----> <a href="/Development/ContributeGuide.html" class="nav-link">ContributeGuide</a></li><li class="dropdown-item"><!----> <a href="/Development/format-changelist.html" class="nav-link">Changelist of TsFile</a></li><li class="dropdown-item"><!----> <a href="/Development/rpc-changelist.html" class="nav-link">Changelist of RPC</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Blog</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Blog/Index.html" class="nav-link">Overview</a></li><li class="dropdown-item"><!----> <a href="/Blog/Release0_93.html" class="nav-link">Some Notes on Release 0.9.3 and upcoming 0.10.0</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">ASF</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="http://www.apache.org/" class="nav-link external">
  Foundation
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external">
  License
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external">
  Security
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external">
  Sponsorship
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external">
  Thanks
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external">
  Current Events
  <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.8.x/5-IoTDB SQL Documentation/1-IoTDB Query Statement.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.8.x/5-IoTDB SQL Documentation/1-IoTDB Query Statement.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link">
    gitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav></div></header> <div class="sidebar-mask"></div> <aside class="sidebar"><nav class="nav-links"><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Document</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/QuickStart/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.12.x/QuickStart/QuickStart.html" class="nav-link">V0.12.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.8.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.8.x</a></li></ul></div></div><div class="nav-item"><a href="/SystemDesign/Architecture/Architecture.html" class="nav-link">System design</a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external">
  Wiki
  <!----></a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Project Committers.html" class="nav-link">People</a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Powered By.html" class="nav-link">Powered By</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">Resources</a></li><li class="dropdown-item"><!----> <a href="/Community/Feedback.html" class="nav-link">Feedback</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Development</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Development/VoteRelease.html" class="nav-link">How to vote</a></li><li class="dropdown-item"><!----> <a href="/Development/HowToCommit.html" class="nav-link">How to Commit</a></li><li class="dropdown-item"><!----> <a href="/Development/Committer.html" class="nav-link">Become a Committer</a></li><li class="dropdown-item"><!----> <a href="/Development/ContributeGuide.html" class="nav-link">ContributeGuide</a></li><li class="dropdown-item"><!----> <a href="/Development/format-changelist.html" class="nav-link">Changelist of TsFile</a></li><li class="dropdown-item"><!----> <a href="/Development/rpc-changelist.html" class="nav-link">Changelist of RPC</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Blog</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Blog/Index.html" class="nav-link">Overview</a></li><li class="dropdown-item"><!----> <a href="/Blog/Release0_93.html" class="nav-link">Some Notes on Release 0.9.3 and upcoming 0.10.0</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">ASF</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="http://www.apache.org/" class="nav-link external">
  Foundation
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external">
  License
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external">
  Security
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external">
  Sponsorship
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external">
  Thanks
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external">
  Current Events
  <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.8.x/5-IoTDB SQL Documentation/1-IoTDB Query Statement.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.8.x/5-IoTDB SQL Documentation/1-IoTDB Query Statement.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link">
    gitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB User Guide (V0.8.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>0-Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1-Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2-Concept Key Concepts and Terminology</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>4-Deployment and Management</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>5-IoTDB SQL Documentation</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.8.x/5-IoTDB SQL Documentation/1-IoTDB Query Statement.html" class="active sidebar-link">IoTDB Query Statement</a></li><li><a href="/UserGuide/V0.8.x/5-IoTDB SQL Documentation/2-Reference.html" class="sidebar-link">Reference</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-JDBC API</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>7-TsFile</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>8-System Tools</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="iotdb-query-statement"><a href="#iotdb-query-statement" class="header-anchor">#</a> IoTDB Query Statement</h1> <p>In this part, we will introduce you IoTDB's Query Language. IoTDB offers you a SQL-like query language for interacting with IoTDB, the query language can be devided into 4 major parts:</p> <ul><li>Schema Statement: statements about schema management are all listed in this section.</li> <li>Data Management Statement: statements about data management (such as: data insertion, data query, etc.) are all listed in this section.</li> <li>Database Management Statement: statements about database management and authentication are all listed in this section.</li> <li>Functions: functions that IoTDB offers are all listed in this section.</li></ul> <p>All of these statements are write in IoTDB's own syntax, for details about the syntax composition, please check the <code>Reference</code> section.</p> <h2 id="schema-statement"><a href="#schema-statement" class="header-anchor">#</a> Schema Statement</h2> <ul><li>Set Storage Group</li></ul> <div class="language-SQL line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">SET</span> STORAGE <span class="token keyword">GROUP</span> <span class="token keyword">TO</span> <span class="token operator">&lt;</span>PrefixPath<span class="token operator">&gt;</span>
Eg: IoTDB <span class="token operator">&gt;</span> <span class="token keyword">SET</span> STORAGE <span class="token keyword">GROUP</span> <span class="token keyword">TO</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>wf01<span class="token punctuation">.</span>wt01
Note: PrefixPath can <span class="token operator">not</span> include <span class="token punctuation">`</span><span class="token operator">*</span><span class="token punctuation">`</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Create Timeseries Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>CREATE TIMESERIES &lt;Timeseries&gt; WITH &lt;AttributeClauses&gt;
AttributeClauses : DATATYPE=&lt;DataTypeValue&gt; COMMA ENCODING=&lt;EncodingValue&gt; [COMMA &lt;ExtraAttributeClause&gt;]*
DataTypeValue: BOOLEAN | DOUBLE | FLOAT | INT32 | INT64 | TEXT
EncodingValue: GORILLA | PLAIN | RLE | TS_2DIFF | REGULAR
ExtraAttributeClause: {
	COMPRESSOR = &lt;CompressorValue&gt;
	MAX_POINT_NUMBER = Integer
}
CompressorValue: UNCOMPRESSED | SNAPPY
Eg: IoTDB &gt; CREATE TIMESERIES root.ln.wf01.wt01.status WITH DATATYPE=BOOLEAN, ENCODING=PLAIN
Eg: IoTDB &gt; CREATE TIMESERIES root.ln.wf01.wt01.temperature WITH DATATYPE=FLOAT, ENCODING=RLE
Eg: IoTDB &gt; CREATE TIMESERIES root.ln.wf01.wt01.temperature WITH DATATYPE=FLOAT, ENCODING=RLE, COMPRESSOR=SNAPPY, MAX_POINT_NUMBER=3
Note: Datatype and encoding type must be corresponding. Please check Chapter 3 Encoding Section for details.
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><ul><li>Delete Timeseries Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>DELETE TIMESERIES &lt;PrefixPath&gt; [COMMA &lt;PrefixPath&gt;]*
Eg: IoTDB &gt; DELETE TIMESERIES root.ln.wf01.wt01.status
Eg: IoTDB &gt; DELETE TIMESERIES root.ln.wf01.wt01.status, root.ln.wf01.wt01.temperature
Eg: IoTDB &gt; DELETE TIMESERIES root.ln.wf01.wt01.*
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>Show All Timeseries Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW TIMESERIES
Eg: IoTDB &gt; SHOW TIMESERIES
Note: This statement can only be used in IoTDB Client. If you need to show all timeseries in JDBC, please use `DataBaseMetadata` interface.
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Show Specific Timeseries Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW TIMESERIES &lt;Path&gt;
Eg: IoTDB &gt; SHOW TIMESERIES root
Eg: IoTDB &gt; SHOW TIMESERIES root.ln
Eg: IoTDB &gt; SHOW TIMESERIES root.ln.*.*.status
Eg: IoTDB &gt; SHOW TIMESERIES root.ln.wf01.wt01.status
Note: The path can be prefix path, star path or timeseries path
Note: This statement can be used in IoTDB Client and JDBC.
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><ul><li>Show Storage Group Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SHOW STORAGE GROUP
Eg: IoTDB &gt; SHOW STORAGE GROUP
Note: This statement can be used in IoTDB Client and JDBC.
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="data-management-statement"><a href="#data-management-statement" class="header-anchor">#</a> Data Management Statement</h2> <ul><li>Insert Record Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>INSERT INTO &lt;PrefixPath&gt; LPAREN TIMESTAMP COMMA &lt;Sensor&gt; [COMMA &lt;Sensor&gt;]* RPAREN VALUES LPAREN &lt;TimeValue&gt;, &lt;PointValue&gt; [COMMA &lt;PointValue&gt;]* RPAREN
Sensor : Identifier
Eg: IoTDB &gt; INSERT INTO root.ln.wf01.wt01(timestamp,status) values(1509465600000,true)
Eg: IoTDB &gt; INSERT INTO root.ln.wf01.wt01(timestamp,status) VALUES(NOW(), false)
Eg: IoTDB &gt; INSERT INTO root.ln.wf01.wt01(timestamp,temperature) VALUES(2017-11-01T00:17:00.000+08:00,24.22028)
Eg: IoTDB &gt; INSERT INTO root.ln.wf01.wt01(timestamp, status, temperature) VALUES (1509466680000, false, 20.060787);
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt; + &lt;Path&gt; = &lt;Timeseries&gt;
Note: The order of Sensor and PointValue need one-to-one correspondence
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><ul><li>Update Record Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>UPDATE &lt;UpdateClause&gt; SET &lt;SetClause&gt; WHERE &lt;WhereClause&gt;
UpdateClause: &lt;prefixPath&gt;
SetClause: &lt;SetExpression&gt; 
SetExpression: &lt;Path&gt; EQUAL &lt;PointValue&gt;
WhereClause : &lt;Condition&gt; [(AND | OR) &lt;Condition&gt;]*
Condition  : &lt;Expression&gt; [(AND | OR) &lt;Expression&gt;]*
Expression : [NOT | !]? TIME PrecedenceEqualOperator &lt;TimeValue&gt;
Eg: IoTDB &gt; UPDATE root.ln.wf01.wt01 SET temperature = 23 WHERE time &lt; NOW() and time &gt; 2017-11-1T00:15:00+08:00
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt; + &lt;Path&gt; = &lt;Timeseries&gt;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><ul><li>Delete Record Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>DELETE FROM &lt;PrefixPath&gt; [COMMA &lt;PrefixPath&gt;]* WHERE TIME LESSTHAN &lt;TimeValue&gt;
Eg: DELETE FROM root.ln.wf01.wt01.temperature WHERE time &lt; 2017-11-1T00:05:00+08:00
Eg: DELETE FROM root.ln.wf01.wt01.status, root.ln.wf01.wt01.temperature WHERE time &lt; NOW()
Eg: DELETE FROM root.ln.wf01.wt01.* WHERE time &lt; 1509466140000
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>Select Record Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT &lt;SelectClause&gt; FROM &lt;FromClause&gt; [WHERE &lt;WhereClause&gt;]?
SelectClause : &lt;SelectPath&gt; (COMMA &lt;SelectPath&gt;)*
SelectPath : &lt;FUNCTION&gt; LPAREN &lt;Path&gt; RPAREN | &lt;Path&gt;
FUNCTION : ‘COUNT’ , ‘MIN_TIME’, ‘MAX_TIME’, ‘MIN_VALUE’, ‘MAX_VALUE’
FromClause : &lt;PrefixPath&gt; (COMMA &lt;PrefixPath&gt;)?
WhereClause : &lt;Condition&gt; [(AND | OR) &lt;Condition&gt;]*
Condition  : &lt;Expression&gt; [(AND | OR) &lt;Expression&gt;]*
Expression : [NOT | !]? &lt;TimeExpr&gt; | [NOT | !]? &lt;SensorExpr&gt;
TimeExpr : TIME PrecedenceEqualOperator &lt;TimeValue&gt;
SensorExpr : (&lt;Timeseries&gt; | &lt;Path&gt;) PrecedenceEqualOperator &lt;PointValue&gt;
Eg: IoTDB &gt; SELECT status, temperature FROM root.ln.wf01.wt01 WHERE temperature &lt; 24 and time &gt; 2017-11-1 0:13:00
Eg. IoTDB &gt; SELECT * FROM root
Eg. IoTDB &gt; SELECT COUNT(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 25
Eg. IoTDB &gt; SELECT MIN_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 25
Eg. IoTDB &gt; SELECT MAX_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &gt; 24
Eg. IoTDB &gt; SELECT MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &gt; 23
Eg. IoTDB &gt; SELECT MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 25
Note: the statement needs to satisfy this constraint: &lt;Path&gt;(SelectClause) + &lt;PrefixPath&gt;(FromClause) = &lt;Timeseries&gt;
Note: If the &lt;SensorExpr&gt;(WhereClause) is started with &lt;Path&gt; and not with ROOT, the statement needs to satisfy this constraint: &lt;PrefixPath&gt;(FromClause) + &lt;Path&gt;(SensorExpr) = &lt;Timeseries&gt;
Note: In Version 0.8.2, if &lt;WhereClause&gt; includes `OR`, time filter can not be used.
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br></div></div><ul><li>Group By Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT &lt;SelectClause&gt; FROM &lt;FromClause&gt; WHERE  &lt;WhereClause&gt; GROUP BY &lt;GroupByClause&gt;
SelectClause : &lt;Function&gt; [COMMA &lt; Function &gt;]*
Function : &lt;AggregationFunction&gt; LPAREN &lt;Path&gt; RPAREN
FromClause : &lt;PrefixPath&gt;
WhereClause : &lt;Condition&gt; [(AND | OR) &lt;Condition&gt;]*
Condition  : &lt;Expression&gt; [(AND | OR) &lt;Expression&gt;]*
Expression : [NOT | !]? &lt;TimeExpr&gt; | [NOT | !]? &lt;SensorExpr&gt;
TimeExpr : TIME PrecedenceEqualOperator &lt;TimeValue&gt;
SensorExpr : (&lt;Timeseries&gt; | &lt;Path&gt;) PrecedenceEqualOperator &lt;PointValue&gt;
GroupByClause : LPAREN &lt;TimeUnit&gt; (COMMA TimeValue)? COMMA &lt;TimeInterval&gt; (COMMA &lt;TimeInterval&gt;)* RPAREN
TimeUnit : Integer &lt;DurationUnit&gt;
DurationUnit : &quot;ms&quot; | &quot;s&quot; | &quot;m&quot; | &quot;h&quot; | &quot;d&quot; | &quot;w&quot;
TimeInterval: LBRACKET &lt;TimeValue&gt; COMMA &lt;TimeValue&gt; RBRACKET
Eg: SELECT COUNT(status), COUNT(temperature) FROM root.ln.wf01.wt01 where temperature &lt; 24 GROUP BY(5m, [1509465720000, 1509466380000])
Eg. SELECT COUNT (status), MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE time &lt; 1509466500000 GROUP BY(5m, 1509465660000, [1509465720000, 1509466380000])
Eg. SELECT MIN_TIME(status), MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE temperature &lt; 25 and time &lt; 1509466800000 GROUP BY (3m, 1509465600000, [1509466140000, 1509466380000], [1509466440000, 1509466620000])
Note: the statement needs to satisfy this constraint: &lt;Path&gt;(SelectClause) + &lt;PrefixPath&gt;(FromClause) = &lt;Timeseries&gt;
Note: If the &lt;SensorExpr&gt;(WhereClause) is started with &lt;Path&gt; and not with ROOT, the statement needs to satisfy this constraint: &lt;PrefixPath&gt;(FromClause) + &lt;Path&gt;(SensorExpr) = &lt;Timeseries&gt;
Note: &lt;TimeValue&gt;(TimeInterval) needs to be greater than 0
Note: First &lt;TimeValue&gt;(TimeInterval) in needs to be smaller than second &lt;TimeValue&gt;(TimeInterval)
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br></div></div><ul><li>Fill Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT &lt;SelectClause&gt; FROM &lt;FromClause&gt; WHERE &lt;WhereClause&gt; FILL &lt;FillClause&gt;
SelectClause : &lt;Path&gt; [COMMA &lt;Path&gt;]*
FromClause : &lt; PrefixPath &gt; [COMMA &lt; PrefixPath &gt;]*
WhereClause : &lt;WhereExpression&gt;
WhereExpression : TIME EQUAL &lt;TimeValue&gt;
FillClause : LPAREN &lt;TypeClause&gt; [COMMA &lt;TypeClause&gt;]* RPAREN
TypeClause : &lt;Int32Clause&gt; | &lt;Int64Clause&gt; | &lt;FloatClause&gt; | &lt;DoubleClause&gt; | &lt;BoolClause&gt; | &lt;TextClause&gt;
Int32Clause: INT32 LBRACKET (&lt;LinearClause&gt; | &lt;PreviousClause&gt;)  RBRACKET
Int64Clause: INT64 LBRACKET (&lt;LinearClause&gt; | &lt;PreviousClause&gt;)  RBRACKET
FloatClause: FLOAT LBRACKET (&lt;LinearClause&gt; | &lt;PreviousClause&gt;)  RBRACKET
DoubleClause: DOUBLE LBRACKET (&lt;LinearClause&gt; | &lt;PreviousClause&gt;)  RBRACKET
BoolClause: BOOLEAN LBRACKET (&lt;LinearClause&gt; | &lt;PreviousClause&gt;)  RBRACKET
TextClause: TEXT LBRACKET (&lt;LinearClause&gt; | &lt;PreviousClause&gt;)  RBRACKET
PreviousClause : PREVIOUS [COMMA &lt;ValidPreviousTime&gt;]?
LinearClause : LINEAR [COMMA &lt;ValidPreviousTime&gt; COMMA &lt;ValidBehindTime&gt;]?
ValidPreviousTime, ValidBehindTime: &lt;TimeUnit&gt;
TimeUnit : Integer &lt;DurationUnit&gt;
DurationUnit : &quot;ms&quot; | &quot;s&quot; | &quot;m&quot; | &quot;h&quot; | &quot;d&quot; | &quot;w&quot;
Eg: SELECT temperature FROM root.ln.wf01.wt01 WHERE time = 2017-11-01T16:37:50.000 FILL(float[previous, 1m])
Eg: SELECT temperature,status FROM root.ln.wf01.wt01 WHERE time = 2017-11-01T16:37:50.000 FILL (float[linear, 1m, 1m], boolean[previous, 1m])
Eg: SELECT temperature,status,hardware FROM root.ln.wf01.wt01 WHERE time = 2017-11-01T16:37:50.000 FILL (float[linear, 1m, 1m], boolean[previous, 1m], text[previous])
Eg: SELECT temperature,status,hardware FROM root.ln.wf01.wt01 WHERE time = 2017-11-01T16:37:50.000 FILL (float[linear], boolean[previous, 1m], text[previous])
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt;(FromClause) + &lt;Path&gt;(SelectClause) = &lt;Timeseries&gt;
Note: Integer in &lt;TimeUnit&gt; needs to be greater than 0
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br></div></div><ul><li>Limit Statement</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT &lt;SelectClause&gt; FROM &lt;FromClause&gt; [WHERE &lt;WhereClause&gt;] [LIMIT &lt;LIMITClause&gt;] [SLIMIT &lt;SLIMITClause&gt;]
SelectClause : [&lt;Path&gt; | Function]+
Function : &lt;AggregationFunction&gt; LPAREN &lt;Path&gt; RPAREN
FromClause : &lt;Path&gt;
WhereClause : &lt;Condition&gt; [(AND | OR) &lt;Condition&gt;]*
Condition : &lt;Expression&gt; [(AND | OR) &lt;Expression&gt;]*
Expression: [NOT|!]?&lt;TimeExpr&gt; | [NOT|!]?&lt;SensorExpr&gt;
TimeExpr : TIME PrecedenceEqualOperator &lt;TimeValue&gt;
SensorExpr : (&lt;Timeseries&gt;|&lt;Path&gt;) PrecedenceEqualOperator &lt;PointValue&gt;
LIMITClause : &lt;N&gt; [OFFSETClause]?
N : NonNegativeInteger
OFFSETClause : OFFSET &lt;OFFSETValue&gt;
OFFSETValue : NonNegativeInteger
SLIMITClause : &lt;SN&gt; [SOFFSETClause]?
SN : NonNegativeInteger
SOFFSETClause : SOFFSET &lt;SOFFSETValue&gt;
SOFFSETValue : NonNegativeInteger
NonNegativeInteger:= ('+')? Digit+
Eg: IoTDB &gt; SELECT status, temperature FROM root.ln.wf01.wt01 WHERE temperature &lt; 24 and time &gt; 2017-11-1 0:13:00 LIMIT 3 OFFSET 2
Eg. IoTDB &gt; SELECT COUNT (status), MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE time &lt; 1509466500000 GROUP BY(5m, 1509465660000, [1509465720000, 1509466380000]) LIMIT 3
Note: The order of &lt;LIMITClause&gt; and &lt;SLIMITClause&gt; does not affect the grammatical correctness.
Note: &lt;SLIMITClause&gt; can only effect in Prefixpath and StarPath.
Note: &lt;FillClause&gt; can not use &lt;LIMITClause&gt; but not &lt;SLIMITClause&gt;.
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br></div></div><h2 id="database-management-statement"><a href="#database-management-statement" class="header-anchor">#</a> Database Management Statement</h2> <ul><li>Create User</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>CREATE USER &lt;userName&gt; &lt;password&gt;;  
userName:=identifier  
password:=identifier
Eg: IoTDB &gt; CREATE USER thulab pwd;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>Delete User</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>DROP USER &lt;userName&gt;;  
userName:=identifier
Eg: IoTDB &gt; DROP USER xiaoming;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Create Role</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>CREATE ROLE &lt;roleName&gt;;  
roleName:=identifie
Eg: IoTDB &gt; CREATE ROLE admin;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Delete Role</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>DROP ROLE &lt;roleName&gt;;  
roleName:=identifier
Eg: IoTDB &gt; DROP ROLE admin;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Grant User Privileges</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>GRANT USER &lt;userName&gt; PRIVILEGES &lt;privileges&gt; ON &lt;nodeName&gt;;  
userName:=identifier  
nodeName:=identifier (DOT identifier)*  
privileges:= string (COMMA string)*
Eg: IoTDB &gt; GRANT USER tempuser PRIVILEGES 'DELETE_TIMESERIES' on root.ln;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>Grant Role Privileges</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>GRANT ROLE &lt;roleName&gt; PRIVILEGES &lt;privileges&gt; ON &lt;nodeName&gt;;  
privileges:= string (COMMA string)*  
roleName:=identifier  
nodeName:=identifier (DOT identifier)*
Eg: IoTDB &gt; GRANT ROLE temprole PRIVILEGES 'DELETE_TIMESERIES' ON root.ln;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>Grant User Role</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>GRANT &lt;roleName&gt; TO &lt;userName&gt;;  
roleName:=identifier  
userName:=identifier
Eg: IoTDB &gt; GRANT temprole TO tempuser;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>Revoke User Privileges</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>REVOKE USER &lt;userName&gt; PRIVILEGES &lt;privileges&gt; ON &lt;nodeName&gt;;   
privileges:= string (COMMA string)*  
userName:=identifier  
nodeName:=identifier (DOT identifier)*
Eg: IoTDB &gt; REVOKE USER tempuser PRIVILEGES 'DELETE_TIMESERIES' on root.ln;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>Revoke Role Privileges</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>REVOKE ROLE &lt;roleName&gt; PRIVILEGES &lt;privileges&gt; ON &lt;nodeName&gt;;  
privileges:= string (COMMA string)*  
roleName:= identifier  
nodeName:=identifier (DOT identifier)*
Eg: IoTDB &gt; REVOKE ROLE temprole PRIVILEGES 'DELETE_TIMESERIES' ON root.ln;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>Revoke Role From User</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>REVOKE &lt;roleName&gt; FROM &lt;userName&gt;;
roleName:=identifier
userName:=identifier
Eg: IoTDB &gt; REVOKE temproleFROM tempuser;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>List Users</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST USER
Eg: IoTDB &gt; LIST USER
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><ul><li>List Roles</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST ROLE
Eg: IoTDB &gt; LIST ROLE
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><ul><li>List Privileges</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST PRIVILEGES USER  &lt;username&gt; ON &lt;path&gt;;    
username:=identifier    
path=‘root’ (DOT identifier)*
Eg: IoTDB &gt; LIST PRIVIEGES USER sgcc_wirte_user ON root.sgcc;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>List Privileges of Roles(On Specific Path)</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST PRIVILEGES ROLE &lt;roleName&gt; ON &lt;path&gt;;    
roleName:=identifier  
path=‘root’ (DOT identifier)*
Eg: IoTDB &gt; LIST PRIVIEGES ROLE wirte_role ON root.sgcc;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>List Privileges of Users</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST USER PRIVILEGES &lt;username&gt; ;   
username:=identifier  
Eg: IoTDB &gt; LIST USER PRIVIEGES tempuser;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>List Privileges of Roles</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST ROLE PRIVILEGES &lt;roleName&gt;
roleName:=identifier
Eg: IoTDB &gt; LIST ROLE PRIVIEGES actor;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>List Roles of Users</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST ALL ROLE OF USER &lt;username&gt; ;  
username:=identifier
Eg: IoTDB &gt; LIST ALL ROLE OF USER tempuser;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>List Users of Role</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>LIST ALL USER OF ROLE &lt;roleName&gt;;
roleName:=identifier
Eg: IoTDB &gt; LIST ALL USER OF ROLE roleuser;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Update Password</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>UPDATE USER &lt;username&gt; SET PASSWORD &lt;password&gt;;
roleName:=identifier
password:=identifier
Eg: IoTDB &gt; UPDATE USER tempuser SET PASSWORD newpwd;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="functions"><a href="#functions" class="header-anchor">#</a> Functions</h2> <ul><li>COUNT</li></ul> <p>The COUNT function returns the value number of timeseries(one or more) non-null values selected by the SELECT statement. The result is a signed 64-bit integer. If there are no matching rows, COUNT () returns 0.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT COUNT(Path) (COMMA COUNT(Path))* FROM &lt;FromClause&gt; [WHERE &lt;WhereClause&gt;]?
Eg. SELECT COUNT(status), COUNT(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 24
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt; + &lt;Path&gt; = &lt;Timeseries&gt;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>FIRST</li></ul> <p>The FIRST function returns the first point value of the choosen timeseries(one or more).</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT FIRST (Path) (COMMA FIRST (Path))* FROM &lt;FromClause&gt; [WHERE &lt;WhereClause&gt;]?
Eg. SELECT FIRST (status), FIRST (temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 24
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt; + &lt;Path&gt; = &lt;Timeseries&gt;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>MAX_TIME</li></ul> <p>The MAX_TIME function returns the maximum timestamp of the choosen timeseries(one or more). The result is a signed 64-bit integer, greater than 0.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT MAX_TIME (Path) (COMMA MAX_TIME (Path))* FROM &lt;FromClause&gt; [WHERE &lt;WhereClause&gt;]?
Eg. SELECT MAX_TIME(status), MAX_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 24
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt; + &lt;Path&gt; = &lt;Timeseries&gt;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>MAX_VALUE</li></ul> <p>The MAX_VALUE function returns the maximum value(lexicographically ordered) of the choosen timeseries (one or more).</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT MAX_VALUE (Path) (COMMA MAX_VALUE (Path))* FROM &lt;FromClause&gt; [WHERE &lt;WhereClause&gt;]?
Eg. SELECT MAX_VALUE(status), MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 24
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt; + &lt;Path&gt; = &lt;Timeseries&gt;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>MEAN</li></ul> <p>The MEAN function returns the arithmetic mean value of the choosen timeseries over a specified period of time. The timeseries must be int32, int64, float, double type, and the other types are not to be calculated. The result is a double type number.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT MEAN (Path) (COMMA MEAN (Path))* FROM &lt;FromClause&gt; [WHERE &lt;WhereClause&gt;]?
Eg. SELECT MEAN (temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 24
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt; + &lt;Path&gt; = &lt;Timeseries&gt;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>MIN_TIME</li></ul> <p>The MIN_TIME function returns the minimum timestamp of the choosen timeseries(one or more). The result is a signed 64-bit integer, greater than 0.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT MIN_TIME (Path) (COMMA MIN_TIME (Path))*FROM &lt;FromClause&gt; [WHERE &lt;WhereClause&gt;]?
Eg. SELECT MIN_TIME(status), MIN_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 24
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt; + &lt;Path&gt; = &lt;Timeseries&gt;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>MIN_VALUE</li></ul> <p>The MIN_VALUE function returns the minimum value(lexicographically ordered) of the choosen timeseries (one or more).</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT MIN_VALUE (Path) (COMMA MIN_VALUE (Path))* FROM &lt;FromClause&gt; [WHERE &lt;WhereClause&gt;]?
Eg. SELECT MIN_VALUE(status),MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 24
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt; + &lt;Path&gt; = &lt;Timeseries&gt;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>NOW</li></ul> <p>The NOW function returns the current timestamp. This function can be used in the data operation statement to represent time. The result is a signed 64-bit integer, greater than 0.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>NOW()
Eg. INSERT INTO root.ln.wf01.wt01(timestamp,status) VALUES(NOW(), false) 
Eg. UPDATE root.ln.wf01.wt01 SET temperature = 23 WHERE time &lt; NOW()
Eg. DELETE FROM root.ln.wf01.wt01.status, root.ln.wf01.wt01.temperature WHERE time &lt; NOW()
Eg. SELECT * FROM root WHERE time &lt; NOW()
Eg. SELECT COUNT(temperature) FROM root.ln.wf01.wt01 WHERE time &lt; NOW()
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><ul><li>SUM</li></ul> <p>The SUM function returns the sum of the choosen timeseries (one or more) over a specified period of time. The timeseries must be int32, int64, float, double type, and the other types are not to be calculated. The result is a double type number.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>SELECT SUM(Path) (COMMA SUM(Path))* FROM &lt;FromClause&gt; [WHERE &lt;WhereClause&gt;]?
Eg. SELECT SUM(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature &lt; 24
Note: the statement needs to satisfy this constraint: &lt;PrefixPath&gt; + &lt;Path&gt; = &lt;Timeseries&gt;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev">
        ←
        <a href="/UserGuide/V0.8.x/4-Deployment and Management/7-Build and use IoTDB by Dockerfile.html" class="prev">
          Dockerfile
        </a></span> <span class="next"><a href="/UserGuide/V0.8.x/5-IoTDB SQL Documentation/2-Reference.html">
          Reference
        </a>
        →
      </span></p></div> <p style="text-align: center;">Copyright © 2021 The Apache Software Foundation.<br>
     Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p> <p style="text-align: center; margin-top: 10px; color: #444">
    Contact us: Join QQ Group 659990460 | Add friend <i>tietouqiao</i> and be invited to Wechat Group<br>
    see <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> for more</p></main></div><div class="global-ui"></div></div>
    <script src="/assets/js/app.38ae92d2.js" defer></script><script src="/assets/js/3.9588d9cb.js" defer></script><script src="/assets/js/4.e8b2d372.js" defer></script><script src="/assets/js/283.37fc50e5.js" defer></script>
  </body>
</html>