(window.webpackJsonp=window.webpackJsonp||[]).push([[1582],{2152:function(s,e,a){"use strict";a.r(e);var n=a(71),t=Object(n.a)({},(function(){var s=this,e=s.$createElement,a=s._self._c||e;return a("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[a("h1",{attrs:{id:"sql-参考文档"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#sql-参考文档"}},[s._v("#")]),s._v(" SQL 参考文档")]),s._v(" "),a("h2",{attrs:{id:"关键字"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#关键字"}},[s._v("#")]),s._v(" 关键字")]),s._v(" "),a("p",[s._v("不要使用这些关键字作为标识符。")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("CREATE, INSERT, UPDATE, DELETE, SELECT, SHOW, GRANT, INTO, SET, WHERE, FROM, TO, BY, DEVICE,\nCONFIGURATION, DESCRIBE, SLIMIT, LIMIT, UNLINK, OFFSET, SOFFSET, FILL, LINEAR, PREVIOUS, PREVIOUSUNTILLAST,\nMETADATA, TIMESERIES, TIMESTAMP, PROPERTY, WITH, ROOT, DATATYPE, COMPRESSOR, STORAGE, GROUP, LABEL,INT32,\nINT64, 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"),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br")])]),a("ul",[a("li",[s._v("显示所有设备语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SHOW DEVICES\nEg: IoTDB > SHOW DEVICES\nNote: This statement can be used in IoTDB Client and JDBC.\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br")])]),a("ul",[a("li",[s._v("显示特定设备语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SHOW DEVICES <PrefixPath>\nEg: IoTDB > SHOW DEVICES root\nEg: IoTDB > SHOW DEVICES root.ln\nEg: IoTDB > SHOW DEVICES root.*.wf01\nNote: The path can be prefix path or star path.\nNote: This statement can be used in IoTDB Client and JDBC.\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br")])]),a("ul",[a("li",[s._v("显示ROOT节点的子节点名称语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SHOW CHILD PATHS\nEg: IoTDB > SHOW CHILD PATHS\nNote: This statement can be used in IoTDB Client and JDBC.\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br")])]),a("ul",[a("li",[s._v("显示子节点名称语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v('SHOW CHILD PATHS <Path>\nEg: IoTDB > SHOW CHILD PATHS root\nEg: IoTDB > SHOW CHILD PATHS root.ln\nEg: IoTDB > SHOW CHILD PATHS root.*.wf01\nEg: IoTDB > SHOW CHILD PATHS root.ln.wf*\nNote: The path can be prefix path or star path, the nodes can be in a "prefix + star" format. \nNote: This statement can be used in IoTDB Client and JDBC.\n')])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br")])]),a("h2",{attrs:{id:"数据管理语句"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#数据管理语句"}},[s._v("#")]),s._v(" 数据管理语句")]),s._v(" "),a("ul",[a("li",[s._v("插入记录语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("INSERT INTO <PrefixPath> LPAREN TIMESTAMP COMMA <Sensor> [COMMA <Sensor>]* RPAREN VALUES LPAREN <TimeValue>, <PointValue> [COMMA <PointValue>]* RPAREN\nSensor : Identifier\nEg: IoTDB > INSERT INTO root.ln.wf01.wt01(timestamp,status) values(1509465600000,true)\nEg: IoTDB > INSERT INTO root.ln.wf01.wt01(timestamp,status) VALUES(NOW(), false)\nEg: IoTDB > INSERT INTO root.ln.wf01.wt01(timestamp,temperature) VALUES(2017-11-01T00:17:00.000+08:00,24.22028)\nEg: IoTDB > INSERT INTO root.ln.wf01.wt01(timestamp, status, temperature) VALUES (1509466680000, false, 20.060787);\nNote: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries>\nNote: The order of Sensor and PointValue need one-to-one correspondence\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br"),a("span",{staticClass:"line-number"},[s._v("8")]),a("br")])]),a("ul",[a("li",[s._v("更新记录语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("UPDATE <UpdateClause> SET <SetClause> WHERE <WhereClause>\nUpdateClause: <prefixPath>\nSetClause: <SetExpression> \nSetExpression: <Path> EQUAL <PointValue>\nWhereClause : <Condition> [(AND | OR) <Condition>]*\nCondition  : <Expression> [(AND | OR) <Expression>]*\nExpression : [NOT | !]? TIME PrecedenceEqualOperator <TimeValue>\nEg: IoTDB > UPDATE root.ln.wf01.wt01 SET temperature = 23 WHERE time < NOW() and time > 2017-11-1T00:15:00+08:00\nNote: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries>\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br"),a("span",{staticClass:"line-number"},[s._v("8")]),a("br"),a("span",{staticClass:"line-number"},[s._v("9")]),a("br")])]),a("ul",[a("li",[s._v("删除记录语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("DELETE FROM <PrefixPath> [COMMA <PrefixPath>]* WHERE TIME LESSTHAN <TimeValue>\nEg: DELETE FROM root.ln.wf01.wt01.temperature WHERE time < 2017-11-1T00:05:00+08:00\nEg: DELETE FROM root.ln.wf01.wt01.status, root.ln.wf01.wt01.temperature WHERE time < NOW()\nEg: DELETE FROM root.ln.wf01.wt01.* WHERE time < 1509466140000\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br")])]),a("ul",[a("li",[s._v("选择记录语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SELECT <SelectClause> FROM <FromClause> [WHERE <WhereClause>]?\nSelectClause : <SelectPath> (COMMA <SelectPath>)*\nSelectPath : <FUNCTION> LPAREN <Path> RPAREN | <Path>\nFUNCTION : ‘COUNT’ , ‘MIN_TIME’, ‘MAX_TIME’, ‘MIN_VALUE’, ‘MAX_VALUE’\nFromClause : <PrefixPath> (COMMA <PrefixPath>)?\nWhereClause : <Condition> [(AND | OR) <Condition>]*\nCondition  : <Expression> [(AND | OR) <Expression>]*\nExpression : [NOT | !]? <TimeExpr> | [NOT | !]? <SensorExpr>\nTimeExpr : TIME PrecedenceEqualOperator (<TimeValue> | <RelativeTime>)\nRelativeTimeDurationUnit = Integer ('Y'|'MO'|'W'|'D'|'H'|'M'|'S'|'MS'|'US'|'NS')\nRelativeTime : (now() | <TimeValue>) [(+|-) RelativeTimeDurationUnit]+\nSensorExpr : (<Timeseries> | <Path>) PrecedenceEqualOperator <PointValue>\nEg: IoTDB > SELECT status, temperature FROM root.ln.wf01.wt01 WHERE temperature < 24 and time > 2017-11-1 0:13:00\nEg. IoTDB > SELECT * FROM root\nEg. IoTDB > SELECT * FROM root where time > now() - 5m\nEg. IoTDB > SELECT * FROM root.ln.*.wf*\nEg. IoTDB > SELECT COUNT(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 25\nEg. IoTDB > SELECT MIN_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 25\nEg. IoTDB > SELECT MAX_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature > 24\nEg. IoTDB > SELECT MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature > 23\nEg. IoTDB > SELECT MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 25\nEg. IoTDB > SELECT COUNT(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 25 GROUP BY LEVEL=1\nNote: the statement needs to satisfy this constraint: <Path>(SelectClause) + <PrefixPath>(FromClause) = <Timeseries>\nNote: If the <SensorExpr>(WhereClause) is started with <Path> and not with ROOT, the statement needs to satisfy this constraint: <PrefixPath>(FromClause) + <Path>(SensorExpr) = <Timeseries>\nNote: In Version 0.7.0, if <WhereClause> includes `OR`, time filter can not be used.\nNote: There must be a space on both sides of the plus and minus operator appearing in the time expression \n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br"),a("span",{staticClass:"line-number"},[s._v("8")]),a("br"),a("span",{staticClass:"line-number"},[s._v("9")]),a("br"),a("span",{staticClass:"line-number"},[s._v("10")]),a("br"),a("span",{staticClass:"line-number"},[s._v("11")]),a("br"),a("span",{staticClass:"line-number"},[s._v("12")]),a("br"),a("span",{staticClass:"line-number"},[s._v("13")]),a("br"),a("span",{staticClass:"line-number"},[s._v("14")]),a("br"),a("span",{staticClass:"line-number"},[s._v("15")]),a("br"),a("span",{staticClass:"line-number"},[s._v("16")]),a("br"),a("span",{staticClass:"line-number"},[s._v("17")]),a("br"),a("span",{staticClass:"line-number"},[s._v("18")]),a("br"),a("span",{staticClass:"line-number"},[s._v("19")]),a("br"),a("span",{staticClass:"line-number"},[s._v("20")]),a("br"),a("span",{staticClass:"line-number"},[s._v("21")]),a("br"),a("span",{staticClass:"line-number"},[s._v("22")]),a("br"),a("span",{staticClass:"line-number"},[s._v("23")]),a("br"),a("span",{staticClass:"line-number"},[s._v("24")]),a("br"),a("span",{staticClass:"line-number"},[s._v("25")]),a("br"),a("span",{staticClass:"line-number"},[s._v("26")]),a("br")])]),a("ul",[a("li",[s._v("Group By 语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SELECT <SelectClause> FROM <FromClause> WHERE  <WhereClause> GROUP BY <GroupByTimeClause>\nSelectClause : <Function> [COMMA < Function >]*\nFunction : <AggregationFunction> LPAREN <Path> RPAREN\nFromClause : <PrefixPath>\nWhereClause : <Condition> [(AND | OR) <Condition>]*\nCondition  : <Expression> [(AND | OR) <Expression>]*\nExpression : [NOT | !]? <TimeExpr> | [NOT | !]? <SensorExpr>\nTimeExpr : TIME PrecedenceEqualOperator (<TimeValue> | <RelativeTime>)\nRelativeTimeDurationUnit = Integer ('Y'|'MO'|'W'|'D'|'H'|'M'|'S'|'MS'|'US'|'NS')\nRelativeTime : (now() | <TimeValue>) [(+|-) RelativeTimeDurationUnit]+\nSensorExpr : (<Timeseries> | <Path>) PrecedenceEqualOperator <PointValue>\nGroupByTimeClause : LPAREN <TimeInterval> COMMA <TimeUnit> (COMMA <TimeUnit>)? RPAREN\nTimeInterval: LSBRACKET <TimeValue> COMMA <TimeValue> RRBRACKET | LRBRACKET <TimeValue> COMMA <TimeValue> RSBRACKET\nTimeUnit : Integer <DurationUnit>\nDurationUnit : \"ms\" | \"s\" | \"m\" | \"h\" | \"d\" | \"w\"\nEg: SELECT COUNT(status), COUNT(temperature) FROM root.ln.wf01.wt01 where temperature < 24 GROUP BY([1509465720000, 1509466380000), 5m)\nEg: SELECT COUNT(status), COUNT(temperature) FROM root.ln.wf01.wt01 where temperature < 24 GROUP BY((1509465720000, 1509466380000], 5m)\nEg. SELECT COUNT (status), MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE time < 1509466500000 GROUP BY([1509465720000, 1509466380000), 5m, 10m)\nEg. SELECT MIN_TIME(status), MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE temperature < 25 GROUP BY ([1509466140000, 1509466380000), 3m, 5ms)\nEg. SELECT MIN_TIME(status), MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE temperature < 25 GROUP BY ((1509466140000, 1509466380000], 3m, 5ms)\nNote: the statement needs to satisfy this constraint: <Path>(SelectClause) + <PrefixPath>(FromClause) = <Timeseries>\nNote: If the <SensorExpr>(WhereClause) is started with <Path> and not with ROOT, the statement needs to satisfy this constraint: <PrefixPath>(FromClause) + <Path>(SensorExpr) = <Timeseries>\nNote: <TimeValue>(TimeInterval) needs to be greater than 0\nNote: First <TimeValue>(TimeInterval) in needs to be smaller than second <TimeValue>(TimeInterval)\nNote: <TimeUnit> needs to be greater than 0\nNote: Third <TimeUnit> if set shouldn't be smaller than second <TimeUnit>\n")])]),s._v(" 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语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v('SELECT <SelectClause> FROM <FromClause> WHERE <WhereClause> FILL <FillClause>\nSelectClause : <Path> [COMMA <Path>]*\nFromClause : < PrefixPath > [COMMA < PrefixPath >]*\nWhereClause : <WhereExpression>\nWhereExpression : TIME EQUAL <TimeValue>\nFillClause : LPAREN <TypeClause> [COMMA <TypeClause>]* RPAREN\nTypeClause : <Int32Clause> | <Int64Clause> | <FloatClause> | <DoubleClause> | <BoolClause> | <TextClause>\nInt32Clause: INT32 LBRACKET (<LinearClause> | <PreviousClause>)  RBRACKET\nInt64Clause: INT64 LBRACKET (<LinearClause> | <PreviousClause>)  RBRACKET\nFloatClause: FLOAT LBRACKET (<LinearClause> | <PreviousClause>)  RBRACKET\nDoubleClause: DOUBLE LBRACKET (<LinearClause> | <PreviousClause>)  RBRACKET\nBoolClause: BOOLEAN LBRACKET (<LinearClause> | <PreviousClause>)  RBRACKET\nTextClause: TEXT LBRACKET (<LinearClause> | <PreviousClause>)  RBRACKET\nPreviousClause : PREVIOUS [COMMA <ValidPreviousTime>]?\nLinearClause : LINEAR [COMMA <ValidPreviousTime> COMMA <ValidBehindTime>]?\nValidPreviousTime, ValidBehindTime: <TimeUnit>\nTimeUnit : Integer <DurationUnit>\nDurationUnit : "ms" | "s" | "m" | "h" | "d" | "w"\nEg: SELECT temperature FROM root.ln.wf01.wt01 WHERE time = 2017-11-01T16:37:50.000 FILL(float[previous, 1m])\nEg: SELECT temperature,status FROM root.ln.wf01.wt01 WHERE time = 2017-11-01T16:37:50.000 FILL (float[linear, 1m, 1m], boolean[previous, 1m])\nEg: 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])\nEg: 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])\nNote: the statement needs to satisfy this constraint: <PrefixPath>(FromClause) + <Path>(SelectClause) = <Timeseries>\nNote: Integer in <TimeUnit> needs to be greater than 0\n')])]),s._v(" 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RBRACKET\nTextClause: TEXT LBRACKET (<PreviousUntilLastClause> | <PreviousClause>)  RBRACKET\nPreviousClause : PREVIOUS\nPreviousUntilLastClause : PREVIOUSUNTILLAST\nEg: SELECT last_value(temperature) FROM root.ln.wf01.wt01 GROUP BY([20, 100), 5m) FILL (float[PREVIOUS])\nEg: SELECT last_value(temperature) FROM root.ln.wf01.wt01 GROUP BY((15, 100], 5m) FILL (float[PREVIOUS])\nEg: SELECT last_value(power) FROM root.ln.wf01.wt01 GROUP BY([20, 100), 5m) FILL (int32[PREVIOUSUNTILLAST])\nEg: SELECT last_value(power) FROM root.ln.wf01.wt01 GROUP BY([20, 100), 5m) FILL (int32[PREVIOUSUNTILLAST, 5m])\nEg: SELECT last_value(temperature), last_value(power) FROM root.ln.wf01.wt01 GROUP BY([20, 100), 5m) FILL (ALL[PREVIOUS])\nEg: SELECT last_value(temperature), last_value(power) FROM root.ln.wf01.wt01 GROUP BY([20, 100), 5m) FILL (ALL[PREVIOUS, 5m])\nNote: In group by fill, sliding step is not supported in group by clause\nNote: Now, only last_value aggregation function is supported in group by 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IoTDB > SELECT COUNT (status), MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE time < 1509466500000 GROUP BY([1509465720000, 1509466380000], 5m) LIMIT 3\nNote: N, OFFSETValue, SN and SOFFSETValue must be greater than 0.\nNote: The order of <LIMITClause> and <SLIMITClause> does not affect the grammatical correctness.\nNote: <FillClause> can not use <LIMITClause> but not <SLIMITClause>.\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br"),a("span",{staticClass:"line-number"},[s._v("8")]),a("br"),a("span",{staticClass:"line-number"},[s._v("9")]),a("br"),a("span",{staticClass:"line-number"},[s._v("10")]),a("br"),a("span",{staticClass:"line-number"},[s._v("11")]),a("br"),a("span",{staticClass:"line-number"},[s._v("12")]),a("br"),a("span",{staticClass:"line-number"},[s._v("13")]),a("br"),a("span",{staticClass:"line-number"},[s._v("14")]),a("br"),a("span",{staticClass:"line-number"},[s._v("15")]),a("br"),a("span",{staticClass:"line-number"},[s._v("16")]),a("br"),a("span",{staticClass:"line-number"},[s._v("17")]),a("br"),a("span",{staticClass:"line-number"},[s._v("18")]),a("br"),a("span",{staticClass:"line-number"},[s._v("19")]),a("br"),a("span",{staticClass:"line-number"},[s._v("20")]),a("br"),a("span",{staticClass:"line-number"},[s._v("21")]),a("br"),a("span",{staticClass:"line-number"},[s._v("22")]),a("br"),a("span",{staticClass:"line-number"},[s._v("23")]),a("br"),a("span",{staticClass:"line-number"},[s._v("24")]),a("br")])]),a("ul",[a("li",[s._v("Align by device语句")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("AlignbyDeviceClause : ALIGN BY DEVICE\n\n规则:  \n1. 大小写不敏感.  \n正例: select * from root.sg1 align by device\n正例: select * from root.sg1 ALIGN BY DEVICE\n\n2. AlignbyDeviceClause 只能放在末尾.  \n正例: select * from root.sg1 where time > 10 align by device  \n错例: select * from root.sg1 align by device where time > 10  \n\n3. Select子句中的path只能是单层，或者通配符，不允许有path分隔符\".\"。\n正例: select s0,s1 from root.sg1.* align by device  \n正例: select s0,s1 from root.sg1.d0, root.sg1.d1 align by device  \n正例: select * from root.sg1.* align by device  \n正例: select * from root align by device  \n正例: select s0,s1,* from root.*.* align by device  \n错例: select d0.s1, d0.s2, d1.s0 from root.sg1 align by device  \n错例: select *.s0, *.s1 from root.* align by device  \n错例: select *.*.* from root align by device\n\n4.相同measurement的各设备的数据类型必须都相同，\n\n正例: select s0 from root.sg1.d0,root.sg1.d1 align by device   \nroot.sg1.d0.s0 and root.sg1.d1.s0 are both INT32.  \n\n正例: select count(s0) from root.sg1.d0,root.sg1.d1 align by device   \ncount(root.sg1.d0.s0) and count(root.sg1.d1.s0) are both INT64.  \n\n错例: select s0 from root.sg1.d0, root.sg2.d3 align by device  \nroot.sg1.d0.s0 is INT32 while root.sg2.d3.s0 is FLOAT. \n\n5. 结果集的展示规则：对于select中给出的列，不论是否有数据（是否被注册），均会被显示。此外，select子句中还支持常数列（例如，'a', '123'等等）。\n例如, \"select s0,s1,s2,'abc',s1,s2 from root.sg.d0, root.sg.d1, root.sg.d2 align by device\". 假设只有下述三列有数据：\n- root.sg.d0.s0\n- root.sg.d0.s1\n- root.sg.d1.s0\n\n结果集形如:\n\n| Time | Device   | s0 | s1 |  s2  | 'abc' | s1 |  s2  |\n| ---  | ---      | ---| ---| null | 'abc' | ---| null |\n|  1   |root.sg.d0| 20 | 2.5| null | 'abc' | 2.5| null |\n|  2   |root.sg.d0| 23 | 3.1| null | 'abc' | 3.1| null |\n| ...  | ...      | ...| ...| null | 'abc' | ...| null |\n|  1   |root.sg.d1| 12 |null| null | 'abc' |null| null |\n|  2   |root.sg.d1| 19 |null| null | 'abc' |null| null |\n| ...  | ...      | ...| ...| null | 'abc' | ...| null |\n\n注意注意 设备'root.sg.d1'的's0'的值全为null\n\n6. 在From中重复写设备名字或者设备前缀是没有任何作用的。\n例如, \"select s0,s1 from root.sg.d0,root.sg.d0,root.sg.d1 align by device\" 等于 \"select s0,s1 from root.sg.d0,root.sg.d1 align by device\".  \n例如. \"select s0,s1 from root.sg.*,root.sg.d0 align by device\" 等于 \"select s0,s1 from root.sg.* align by device\".  \n\n7. 在Select子句中重复写列名是生效的。例如, \"select s0,s0,s1 from root.sg.* align by device\" 不等于 \"select s0,s1 from root.sg.* align by device\".\n\n8. 在Where子句中时间过滤条件和值过滤条件均可以使用，值过滤条件可以使用叶子节点 path，或以 root 开头的整个 path，不允许存在通配符。例如，\n- select * from root.sg.* where time = 1 align by device\n- select * from root.sg.* where s0 < 100 align by device\n- select * from root.sg.* where time < 20 AND s0 > 50 align by device\n- select * from root.sg.d0 where root.sg.d0.s0 = 15 align by device\n\n9. 更多正例:\n   - select * from root.vehicle align by device\n   - select s0,s0,s1 from root.vehicle.* align by device\n   - select s0,s1 from root.vehicle.* limit 10 offset 1 align by device\n   - select * from root.vehicle slimit 10 soffset 2 align by device\n   - select * from root.vehicle where time > 10 align by device\n   - select * from root.vehicle.* where time < 10 AND s0 > 25 align by device\n   - select * from root.vehicle where root.vehicle.d0.s0>0 align by device\n   - select count(*) from root.vehicle align by device\n   - select sum(*) from root.vehicle GROUP BY 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SELECT LAST_VALUE (status), LAST_VALUE (temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24\nNote: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries>\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br")])]),a("ul",[a("li",[s._v("MAX_TIME")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SELECT MAX_TIME (Path) (COMMA MAX_TIME (Path))* FROM <FromClause> [WHERE <WhereClause>]?\nEg. SELECT MAX_TIME(status), MAX_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24\nNote: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries>\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br")])]),a("ul",[a("li",[s._v("MAX_VALUE")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SELECT MAX_VALUE (Path) (COMMA MAX_VALUE (Path))* FROM <FromClause> [WHERE <WhereClause>]?\nEg. SELECT MAX_VALUE(status), MAX_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24\nNote: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries>\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br")])]),a("ul",[a("li",[s._v("AVG\n原有的 "),a("code",[s._v("MEAN")]),s._v(" 方法在 "),a("code",[s._v("v0.9.0")]),s._v(" 版本更名为 "),a("code",[s._v("AVG")]),s._v("。")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SELECT AVG (Path) (COMMA AVG (Path))* FROM <FromClause> [WHERE <WhereClause>]?\nEg. SELECT AVG (temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24\nNote: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries>\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br")])]),a("ul",[a("li",[s._v("MIN_TIME")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SELECT MIN_TIME (Path) (COMMA MIN_TIME (Path))*FROM <FromClause> [WHERE <WhereClause>]?\nEg. SELECT MIN_TIME(status), MIN_TIME(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24\nNote: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries>\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br")])]),a("ul",[a("li",[s._v("MIN_VALUE")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SELECT MIN_VALUE (Path) (COMMA MIN_VALUE (Path))* FROM <FromClause> [WHERE <WhereClause>]?\nEg. SELECT MIN_VALUE(status),MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24\nNote: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries>\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br")])]),a("ul",[a("li",[s._v("NOW")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("NOW()\nEg. INSERT INTO root.ln.wf01.wt01(timestamp,status) VALUES(NOW(), false) \nEg. UPDATE root.ln.wf01.wt01 SET temperature = 23 WHERE time < NOW()\nEg. DELETE FROM root.ln.wf01.wt01.status, root.ln.wf01.wt01.temperature WHERE time < NOW()\nEg. SELECT * FROM root WHERE time < NOW()\nEg. SELECT COUNT(temperature) FROM root.ln.wf01.wt01 WHERE time < NOW()\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br")])]),a("ul",[a("li",[s._v("SUM")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SELECT SUM(Path) (COMMA SUM(Path))* FROM <FromClause> [WHERE <WhereClause>]?\nEg. SELECT SUM(temperature) FROM root.ln.wf01.wt01 WHERE root.ln.wf01.wt01.temperature < 24\nNote: the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries>\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br")])]),a("h2",{attrs:{id:"ttl"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#ttl"}},[s._v("#")]),s._v(" TTL")]),s._v(" "),a("p",[s._v("IoTDB支持对存储组级别设置数据存活时间（TTL），这使得IoTDB可以定期、自动地删除一定时间之前的数据。合理使用TTL\n可以帮助您控制IoTDB占用的总磁盘空间以避免出现磁盘写满等异常。并且，随着文件数量的增多，查询性能往往随之下降,\n内存占用也会有所提高。及时地删除一些较老的文件有助于使查询性能维持在一个较高的水平和减少内存资源的占用。\nIoTDB中的TTL操作通可以由以下的语句进行实现：")]),s._v(" "),a("ul",[a("li",[s._v("设置 TTL")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SET TTL TO StorageGroupName TTLTime\nEg. SET TTL TO root.group1 3600000\n这个例子展示了如何使得root.group1这个存储组只保留近一个小时的数据，一个小时前的数据会被删除或者进入不可见状态。\n注意: TTLTime 应是毫秒时间戳。一旦TTL被设置，超过TTL时间范围的写入将被拒绝。\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br")])]),a("ul",[a("li",[s._v("取消 TTL")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("UNSET TTL TO StorageGroupName\nEg. UNSET TTL TO root.group1\n这个例子展示了如何取消存储组root.group1的TTL，这将使得该存储组接受任意时刻的数据。\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br")])]),a("ul",[a("li",[s._v("显示 TTL")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("SHOW ALL TTL\nSHOW TTL ON StorageGroupNames\nEg.1 SHOW ALL TTL\n这个例子会给出所有存储组的TTL。\nEg.2 SHOW TTL ON root.group1,root.group2,root.group3\n这个例子会显示指定的三个存储组的TTL。\n注意: 没有设置TTL的存储组的TTL将显示为null。\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br")])]),a("p",[s._v("注意：当您对某个存储组设置TTL的时候，超过TTL范围的数据将会立即不可见。但由于数据文件可能混合包含处在TTL范围内\n与范围外的数据，同时数据文件可能正在接受查询，数据文件的物理删除不会立即进行。如果你在此时取消或者调大TTL，\n一部分之前不可见的数据可能重新可见，而那些已经被物理删除的数据则将永久丢失。也就是说，TTL操作不会原子性地删除\n对应的数据。因此我们不推荐您频繁修改TTL，除非您能接受该操作带来的一定程度的不可预知性。")]),s._v(" "),a("h1",{attrs:{id:"参考"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#参考"}},[s._v("#")]),s._v(" 参考")]),s._v(" "),a("h2",{attrs:{id:"关键字-2"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#关键字-2"}},[s._v("#")]),s._v(" 关键字")]),s._v(" "),a("div",{staticClass:"language- 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'<';\nGREATERTHANOREQUALTO := '>=';\nGREATERTHAN := '>';\nDIVIDE := '/';\nPLUS := '+';\nMINUS := '-';\nSTAR := '*';\nLetter := 'a'..'z' | 'A'..'Z';\nHexDigit := 'a'..'f' | 'A'..'F';\nDigit := '0'..'9';\nBoolean := TRUE | FALSE | 0 | 1 (case insensitive)\n\n")])]),s._v(" 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