(window.webpackJsonp=window.webpackJsonp||[]).push([[87],{650:function(e,s,a){"use strict";a.r(s);var t=a(69),n=Object(t.a)({},(function(){var e=this,s=e.$createElement,a=e._self._c||s;return a("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[a("h1",{attrs:{id:"sql-reference"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#sql-reference"}},[e._v("#")]),e._v(" SQL Reference")]),e._v(" "),a("p",[e._v("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:")]),e._v(" "),a("ul",[a("li",[e._v("Schema Statement: statements about schema management are all listed in this section.")]),e._v(" "),a("li",[e._v("Data Management Statement: statements about data management (such as: data insertion, data query, etc.) are all listed in this section.")]),e._v(" "),a("li",[e._v("Database Management Statement: statements about database management and authentication are all listed in this section.")]),e._v(" "),a("li",[e._v("Functions: functions that IoTDB offers are all listed in this section.")])]),e._v(" "),a("p",[e._v("All of these statements are write in IoTDB's own syntax, for details about the syntax composition, please check the "),a("code",[e._v("Reference")]),e._v(" section.")]),e._v(" "),a("h2",{attrs:{id:"show-version"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#show-version"}},[e._v("#")]),e._v(" Show 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line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("COUNT NODES <Path> LEVEL=<INTEGER>\nEg: IoTDB > COUNT NODES root LEVEL=2\nEg: IoTDB > COUNT NODES root.ln LEVEL=2\nEg: IoTDB > COUNT NODES root.ln.* LEVEL=3\nEg: IoTDB > COUNT NODES root.ln.wf01 LEVEL=3\nNote: The path can be prefix path or timeseries path.\nNote: This statement can be used in IoTDB Client and JDBC.\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br")])]),a("ul",[a("li",[e._v("Show All Devices Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SHOW DEVICES (WITH STORAGE GROUP)? limitClause? \nEg: IoTDB > SHOW DEVICES\nEg: IoTDB > SHOW DEVICES WITH STORAGE GROUP\nNote: This statement can be used in IoTDB Client and JDBC.\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br")])]),a("ul",[a("li",[e._v("Show Specific Devices Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SHOW DEVICES <PrefixPath> (WITH STORAGE GROUP)? limitClause?\nEg: IoTDB > SHOW DEVICES root\nEg: IoTDB > SHOW DEVICES root.ln\nEg: IoTDB > SHOW DEVICES root.*.wf01\nEg: IoTDB > SHOW DEVICES root.ln WITH STORAGE GROUP\nEg: IoTDB > SHOW DEVICES root.*.wf01 WITH STORAGE GROUP\nNote: The path can be prefix path or star path.\nNote: This statement can be used in IoTDB Client and JDBC.\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br")])]),a("ul",[a("li",[e._v("Show Child Paths of Root Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SHOW CHILD PATHS\nEg: IoTDB > SHOW CHILD PATHS\nNote: This statement can be used in IoTDB Client and JDBC.\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("Show Child Paths Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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')])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br")])]),a("ul",[a("li",[e._v("Create snapshot for schema")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("CREATE SNAPSHOT FOR SCHEMA\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br")])]),a("h2",{attrs:{id:"data-management-statement"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#data-management-statement"}},[e._v("#")]),e._v(" Data Management Statement")]),e._v(" "),a("ul",[a("li",[e._v("Insert Record Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br")])]),a("ul",[a("li",[e._v("Delete Record Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("DELETE FROM <PrefixPath> [COMMA <PrefixPath>]* [WHERE <WhereClause>]?\nWhereClause : <Condition> [(AND) <Condition>]*\nCondition  : <TimeExpr> [(AND) <TimeExpr>]*\nTimeExpr : TIME PrecedenceEqualOperator (<TimeValue> | <RelativeTime>)\nEg: DELETE FROM root.ln.wf01.wt01.temperature WHERE time > 2016-01-05T00:15:00+08:00 and 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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br")])]),a("ul",[a("li",[e._v("Select Record Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br"),a("span",{staticClass:"line-number"},[e._v("9")]),a("br"),a("span",{staticClass:"line-number"},[e._v("10")]),a("br"),a("span",{staticClass:"line-number"},[e._v("11")]),a("br"),a("span",{staticClass:"line-number"},[e._v("12")]),a("br"),a("span",{staticClass:"line-number"},[e._v("13")]),a("br"),a("span",{staticClass:"line-number"},[e._v("14")]),a("br"),a("span",{staticClass:"line-number"},[e._v("15")]),a("br"),a("span",{staticClass:"line-number"},[e._v("16")]),a("br"),a("span",{staticClass:"line-number"},[e._v("17")]),a("br"),a("span",{staticClass:"line-number"},[e._v("18")]),a("br"),a("span",{staticClass:"line-number"},[e._v("19")]),a("br"),a("span",{staticClass:"line-number"},[e._v("20")]),a("br"),a("span",{staticClass:"line-number"},[e._v("21")]),a("br"),a("span",{staticClass:"line-number"},[e._v("22")]),a("br"),a("span",{staticClass:"line-number"},[e._v("23")]),a("br"),a("span",{staticClass:"line-number"},[e._v("24")]),a("br"),a("span",{staticClass:"line-number"},[e._v("25")]),a("br"),a("span",{staticClass:"line-number"},[e._v("26")]),a("br")])]),a("ul",[a("li",[e._v("Group By Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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\" | \"mo\"\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)\nEg. SELECT MIN_TIME(status), MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE temperature < 25 GROUP BY ((1509466140000, 1509466380000], 1mo)\nEg. SELECT MIN_TIME(status), MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE temperature < 25 GROUP BY ((1509466140000, 1509466380000], 1mo, 1mo)\nEg. SELECT MIN_TIME(status), MIN_VALUE(temperature) FROM root.ln.wf01.wt01 WHERE temperature < 25 GROUP BY ((1509466140000, 1509466380000], 1mo, 2mo)\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>\nNote: If the second <DurationUnit> is \"mo\", the third <DurationUnit> need to be in month\nNote: If the third <DurationUnit> is \"mo\", the second <DurationUnit> can be in any unit\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br"),a("span",{staticClass:"line-number"},[e._v("9")]),a("br"),a("span",{staticClass:"line-number"},[e._v("10")]),a("br"),a("span",{staticClass:"line-number"},[e._v("11")]),a("br"),a("span",{staticClass:"line-number"},[e._v("12")]),a("br"),a("span",{staticClass:"line-number"},[e._v("13")]),a("br"),a("span",{staticClass:"line-number"},[e._v("14")]),a("br"),a("span",{staticClass:"line-number"},[e._v("15")]),a("br"),a("span",{staticClass:"line-number"},[e._v("16")]),a("br"),a("span",{staticClass:"line-number"},[e._v("17")]),a("br"),a("span",{staticClass:"line-number"},[e._v("18")]),a("br"),a("span",{staticClass:"line-number"},[e._v("19")]),a("br"),a("span",{staticClass:"line-number"},[e._v("20")]),a("br"),a("span",{staticClass:"line-number"},[e._v("21")]),a("br"),a("span",{staticClass:"line-number"},[e._v("22")]),a("br"),a("span",{staticClass:"line-number"},[e._v("23")]),a("br"),a("span",{staticClass:"line-number"},[e._v("24")]),a("br"),a("span",{staticClass:"line-number"},[e._v("25")]),a("br"),a("span",{staticClass:"line-number"},[e._v("26")]),a("br"),a("span",{staticClass:"line-number"},[e._v("27")]),a("br"),a("span",{staticClass:"line-number"},[e._v("28")]),a("br"),a("span",{staticClass:"line-number"},[e._v("29")]),a("br"),a("span",{staticClass:"line-number"},[e._v("30")]),a("br"),a("span",{staticClass:"line-number"},[e._v("31")]),a("br")])]),a("ul",[a("li",[e._v("Fill Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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')])]),e._v(" 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By Fill Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SELECT <SelectClause> FROM <FromClause> WHERE  <WhereClause> GROUP BY <GroupByClause> (FILL <GROUPBYFillClause>)?\nGroupByClause : LPAREN <TimeInterval> COMMA <TimeUnit> RPAREN\nGROUPBYFillClause : LPAREN <TypeClause> RPAREN\nTypeClause : <AllClause> | <Int32Clause> | <Int64Clause> | <FloatClause> | <DoubleClause> | <BoolClause> | <TextClause> \nAllClause: ALL LBRACKET (<PreviousUntilLastClause> | <PreviousClause>)  RBRACKET\nInt32Clause: INT32 LBRACKET (<PreviousUntilLastClause> | <PreviousClause>)  RBRACKET\nInt64Clause: INT64 LBRACKET (<PreviousUntilLastClause> | <PreviousClause>)  RBRACKET\nFloatClause: FLOAT LBRACKET (<PreviousUntilLastClause> | <PreviousClause>)  RBRACKET\nDoubleClause: DOUBLE LBRACKET (<PreviousUntilLastClause> | <PreviousClause>)  RBRACKET\nBoolClause: BOOLEAN LBRACKET (<PreviousUntilLastClause> | <PreviousClause>)  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 fill.\nNote: Linear fill is not supported in group by fill.\n")])]),e._v(" 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by time Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SELECT <SelectClause> FROM <FromClause> WHERE  <WhereClause> GROUP BY <GroupByClause> (FILL <GROUPBYFillClause>)? orderByTimeClause?\norderByTimeClause: order by time (asc | desc)?\n\nEg: SELECT last_value(temperature) FROM root.ln.wf01.wt01 GROUP BY([20, 100), 5m) FILL (float[PREVIOUS]) order by time desc\nEg: SELECT * from root order by time desc\nEg: SELECT * from root order by time desc align by device \nEg: SELECT * from root order by time desc disable align\nEg: SELECT last * from root order by time desc\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br")])]),a("ul",[a("li",[e._v("Limit Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SELECT <SelectClause> FROM <FromClause> [WHERE <WhereClause>] [<LIMITClause>] [<SLIMITClause>]\nSelectClause : [<Path> | Function]+\nFunction : <AggregationFunction> LPAREN <Path> RPAREN\nFromClause : <Path>\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>\nLIMITClause : LIMIT <N> [OFFSETClause]?\nN : Integer\nOFFSETClause : OFFSET <OFFSETValue>\nOFFSETValue : Integer\nSLIMITClause : SLIMIT <SN> [SOFFSETClause]?\nSN : Integer\nSOFFSETClause : SOFFSET <SOFFSETValue>\nSOFFSETValue : Integer\nEg: IoTDB > SELECT status, temperature FROM root.ln.wf01.wt01 WHERE temperature < 24 and time > 2017-11-1 0:13:00 LIMIT 3 OFFSET 2\nEg. 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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br"),a("span",{staticClass:"line-number"},[e._v("9")]),a("br"),a("span",{staticClass:"line-number"},[e._v("10")]),a("br"),a("span",{staticClass:"line-number"},[e._v("11")]),a("br"),a("span",{staticClass:"line-number"},[e._v("12")]),a("br"),a("span",{staticClass:"line-number"},[e._v("13")]),a("br"),a("span",{staticClass:"line-number"},[e._v("14")]),a("br"),a("span",{staticClass:"line-number"},[e._v("15")]),a("br"),a("span",{staticClass:"line-number"},[e._v("16")]),a("br"),a("span",{staticClass:"line-number"},[e._v("17")]),a("br"),a("span",{staticClass:"line-number"},[e._v("18")]),a("br"),a("span",{staticClass:"line-number"},[e._v("19")]),a("br"),a("span",{staticClass:"line-number"},[e._v("20")]),a("br"),a("span",{staticClass:"line-number"},[e._v("21")]),a("br"),a("span",{staticClass:"line-number"},[e._v("22")]),a("br"),a("span",{staticClass:"line-number"},[e._v("23")]),a("br"),a("span",{staticClass:"line-number"},[e._v("24")]),a("br")])]),a("ul",[a("li",[e._v("Align By Device Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("AlignbyDeviceClause : ALIGN BY DEVICE\n\nRules:  \n1. Both uppercase and lowercase are ok.  \nCorrect example: select * from root.sg1 align by device  \nCorrect example: select * from root.sg1 ALIGN BY DEVICE  \n\n2. AlignbyDeviceClause can only be used at the end of a query statement.  \nCorrect example: select * from root.sg1 where time > 10 align by device  \nWrong example: select * from root.sg1 align by device where time > 10  \n\n3. The paths of the SELECT clause can only be single level. In other words, the paths of the SELECT clause can only be measurements or STAR, without DOT.\nCorrect example: select s0,s1 from root.sg1.* align by device  \nCorrect example: select s0,s1 from root.sg1.d0, root.sg1.d1 align by device  \nCorrect example: select * from root.sg1.* align by device  \nCorrect example: select * from root align by device  \nCorrect example: select s0,s1,* from root.*.* align by device  \nWrong example: select d0.s1, d0.s2, d1.s0 from root.sg1 align by device  \nWrong example: select *.s0, *.s1 from root.* align by device  \nWrong example: select *.*.* from root align by device\n\n4. The data types of the same measurement column should be the same across devices. \nNote that when it comes to aggregated paths, the data type of the measurement column will reflect \nthe aggregation function rather than the original timeseries.\n\nCorrect example: 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\nCorrect example: 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\nWrong example: 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. The display principle of the result table is that all the columns (no matther whther a column has has existing data) will be shown, with nonexistent cells being null. Besides, the select clause support const column (e.g., 'a', '123' etc..).  \nFor example, \"select s0,s1,s2,'abc',s1,s2 from root.sg.d0, root.sg.d1, root.sg.d2 align by device\". Suppose that the actual existing timeseries are as follows:  \n- root.sg.d0.s0\n- root.sg.d0.s1\n- root.sg.d1.s0\n\nThen you could expect a table like:  \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\nNote that the cells of measurement 's0' and device 'root.sg.d1' are all null.    \n\n6. The duplicated devices in the prefix paths are neglected.  \nFor example, \"select s0,s1 from root.sg.d0,root.sg.d0,root.sg.d1 align by device\" is equal to \"select s0,s1 from root.sg.d0,root.sg.d1 align by device\".  \nFor example. \"select s0,s1 from root.sg.*,root.sg.d0 align by device\" is equal to \"select s0,s1 from root.sg.* align by device\".  \n\n7. The duplicated measurements in the suffix paths are not neglected.  \nFor example, \"select s0,s0,s1 from root.sg.* align by device\" is not equal to \"select s0,s1 from root.sg.* align by device\".\n\n8. Both time predicates and value predicates are allowed in Where Clause. The paths of the value predicates can be the leaf node or full path started with ROOT. And wildcard is not allowed here. For example:\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. More correct examples:\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 (20ms,0,[2,50]) align by device\n   - select * from root.vehicle where time = 3 Fill(int32[previous, 5ms]) align by device\n")])]),e._v(" 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Align Statement")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("Disable Align Clause: DISABLE ALIGN\n\nRules:  \n1. Both uppercase and lowercase are ok.  \nCorrect example: select * from root.sg1 disable align  \nCorrect example: select * from root.sg1 DISABLE ALIGN  \n\n2. Disable Align Clause can only be used at the end of a query statement.  \nCorrect example: select * from root.sg1 where time > 10 disable align \nWrong example: select * from root.sg1 disable align where time > 10 \n\n3. Disable Align Clause cannot be used with Aggregation, Fill Statements, Group By or Group By Device Statements, but can with Limit Statements.\nCorrect example: select * from root.sg1 limit 3 offset 2 disable align\nCorrect example: select * from root.sg1 slimit 3 soffset 2 disable align\nWrong example: select count(s0),count(s1) from root.sg1.d1 disable align\nWrong example: select * from root.vehicle where root.vehicle.d0.s0>0 disable align\nWrong example: select * from root.vehicle align by device disable align\n\n4. The display principle of the result table is that only when the column (or row) has existing data will the column (or row) be shown, with nonexistent cells being empty.\n\nYou could expect a table like:\n| Time | root.sg.d0.s1 | Time | root.sg.d0.s2 | Time | root.sg.d1.s1 |\n| ---  | ---           | ---  | ---           | ---  | ---           |\n|  1   | 100           | 20   | 300           | 400  | 600           |\n|  2   | 300           | 40   | 800           | 700  | 900           |\n|  4   | 500           |      |               | 800  | 1000          |\n|      |               |      |               | 900  | 8000          |\n\n5. More correct examples: \n   - select * from root.vehicle disable align\n   - select s0,s0,s1 from root.vehicle.* disable align\n   - select s0,s1 from root.vehicle.* limit 10 offset 1 disable align\n   - select * from root.vehicle slimit 10 soffset 2 disable align\n   - select * from root.vehicle where time > 10 disable align\n\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br"),a("span",{staticClass:"line-number"},[e._v("9")]),a("br"),a("span",{staticClass:"line-number"},[e._v("10")]),a("br"),a("span",{staticClass:"line-number"},[e._v("11")]),a("br"),a("span",{staticClass:"line-number"},[e._v("12")]),a("br"),a("span",{staticClass:"line-number"},[e._v("13")]),a("br"),a("span",{staticClass:"line-number"},[e._v("14")]),a("br"),a("span",{staticClass:"line-number"},[e._v("15")]),a("br"),a("span",{staticClass:"line-number"},[e._v("16")]),a("br"),a("span",{staticClass:"line-number"},[e._v("17")]),a("br"),a("span",{staticClass:"line-number"},[e._v("18")]),a("br"),a("span",{staticClass:"line-number"},[e._v("19")]),a("br"),a("span",{staticClass:"line-number"},[e._v("20")]),a("br"),a("span",{staticClass:"line-number"},[e._v("21")]),a("br"),a("span",{staticClass:"line-number"},[e._v("22")]),a("br"),a("span",{staticClass:"line-number"},[e._v("23")]),a("br"),a("span",{staticClass:"line-number"},[e._v("24")]),a("br"),a("span",{staticClass:"line-number"},[e._v("25")]),a("br"),a("span",{staticClass:"line-number"},[e._v("26")]),a("br"),a("span",{staticClass:"line-number"},[e._v("27")]),a("br"),a("span",{staticClass:"line-number"},[e._v("28")]),a("br"),a("span",{staticClass:"line-number"},[e._v("29")]),a("br"),a("span",{staticClass:"line-number"},[e._v("30")]),a("br"),a("span",{staticClass:"line-number"},[e._v("31")]),a("br"),a("span",{staticClass:"line-number"},[e._v("32")]),a("br"),a("span",{staticClass:"line-number"},[e._v("33")]),a("br"),a("span",{staticClass:"line-number"},[e._v("34")]),a("br"),a("span",{staticClass:"line-number"},[e._v("35")]),a("br")])]),a("ul",[a("li",[e._v("Select Last Record Statement")])]),e._v(" "),a("p",[e._v("The LAST function returns the last time-value pair of the given timeseries. Currently filters are not supported in LAST queries.")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SELECT LAST <SelectClause> FROM <FromClause>\nSelect Clause : <Path> [COMMA <Path>]*\nFromClause : < PrefixPath > [COMMA < PrefixPath >]*\nWhereClause : <TimeExpr> [(AND | OR) <TimeExpr>]*\nTimeExpr : TIME PrecedenceEqualOperator (<TimeValue> | <RelativeTime>)\n\nEg. SELECT LAST s1 FROM root.sg.d1\nEg. SELECT LAST s1, s2 FROM root.sg.d1\nEg. SELECT LAST s1 FROM root.sg.d1, root.sg.d2\nEg. SELECT LAST s1 FROM root.sg.d1 where time > 100\nEg. SELECT LAST s1, s2 FROM root.sg.d1 where time >= 500\n\nRules:\n1. the statement needs to satisfy this constraint: <PrefixPath> + <Path> = <Timeseries>\n\n2. SELECT LAST only supports time filter that contains '>' or '>=' currently.\n\n3. The result set of last query will always be displayed in a fixed three column table format.\nFor example, \"select last s1, s2 from root.sg.d1, root.sg.d2\", the query result would be:\n\n| Time | Path         | Value |\n| ---  | ------------ | ----- |\n|  5   | root.sg.d1.s1| 100   |\n|  2   | root.sg.d1.s2| 400   |\n|  4   | root.sg.d2.s1| 250   |\n|  9   | root.sg.d2.s2| 600   |\n\n4. It is not supported to use \"diable align\" in LAST query. \n\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br"),a("span",{staticClass:"line-number"},[e._v("9")]),a("br"),a("span",{staticClass:"line-number"},[e._v("10")]),a("br"),a("span",{staticClass:"line-number"},[e._v("11")]),a("br"),a("span",{staticClass:"line-number"},[e._v("12")]),a("br"),a("span",{staticClass:"line-number"},[e._v("13")]),a("br"),a("span",{staticClass:"line-number"},[e._v("14")]),a("br"),a("span",{staticClass:"line-number"},[e._v("15")]),a("br"),a("span",{staticClass:"line-number"},[e._v("16")]),a("br"),a("span",{staticClass:"line-number"},[e._v("17")]),a("br"),a("span",{staticClass:"line-number"},[e._v("18")]),a("br"),a("span",{staticClass:"line-number"},[e._v("19")]),a("br"),a("span",{staticClass:"line-number"},[e._v("20")]),a("br"),a("span",{staticClass:"line-number"},[e._v("21")]),a("br"),a("span",{staticClass:"line-number"},[e._v("22")]),a("br"),a("span",{staticClass:"line-number"},[e._v("23")]),a("br"),a("span",{staticClass:"line-number"},[e._v("24")]),a("br"),a("span",{staticClass:"line-number"},[e._v("25")]),a("br"),a("span",{staticClass:"line-number"},[e._v("26")]),a("br"),a("span",{staticClass:"line-number"},[e._v("27")]),a("br"),a("span",{staticClass:"line-number"},[e._v("28")]),a("br"),a("span",{staticClass:"line-number"},[e._v("29")]),a("br")])]),a("ul",[a("li",[e._v("As Statement")])]),e._v(" "),a("p",[e._v("As statement assigns an alias to time seires queried in SELECT statement")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("You can use as statement in all queries, but some rules are restricted about wildcard.\n\n1. Raw data query\nselect s1 as speed, s2 as temperature from root.sg.d1\n\nThe result set will be like：\n| Time | speed | temperature |\n|  ... |  ...  |     ....    |\n\n2. Aggregation query\nselect count(s1) as s1_num, max_value(s2) as s2_max from root.sg.d1\n\n3. Down-frequence query\nselect count(s1) as s1_num from root.sg.d1 group by ([100,500), 80ms)\n\n4. Align by device query\nselect s1 as speed, s2 as temperature from root.sg.d1 align by device\n\nselect count(s1) as s1_num, count(s2), count(s3) as s3_num from root.sg.d2 align by device\n\n5. Last Record query\nselect last s1 as speed, s2 from root.sg.d1\n\nRules：\n1. In addition to Align by device query，each AS statement has to corresponding to one time series exactly.\n\nE.g. select s1 as temperature from root.sg.*\n\nAt this time if `root.sg.*` includes more than one device，then an exception will be thrown。\n\n2. In align by device query，the prefix path that each AS statement corresponding to can includes multiple device, but the suffix path can only be single sensor.\n\nE.g. select s1 as temperature from root.sg.*\n\nIn this situation, it will be show correctly even if multiple devices are selected.\n\nE.g. select * as temperature from root.sg.d1\n\nIn this situation, it will throws an exception if * corresponds to multiple sensors.\n\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br"),a("span",{staticClass:"line-number"},[e._v("9")]),a("br"),a("span",{staticClass:"line-number"},[e._v("10")]),a("br"),a("span",{staticClass:"line-number"},[e._v("11")]),a("br"),a("span",{staticClass:"line-number"},[e._v("12")]),a("br"),a("span",{staticClass:"line-number"},[e._v("13")]),a("br"),a("span",{staticClass:"line-number"},[e._v("14")]),a("br"),a("span",{staticClass:"line-number"},[e._v("15")]),a("br"),a("span",{staticClass:"line-number"},[e._v("16")]),a("br"),a("span",{staticClass:"line-number"},[e._v("17")]),a("br"),a("span",{staticClass:"line-number"},[e._v("18")]),a("br"),a("span",{staticClass:"line-number"},[e._v("19")]),a("br"),a("span",{staticClass:"line-number"},[e._v("20")]),a("br"),a("span",{staticClass:"line-number"},[e._v("21")]),a("br"),a("span",{staticClass:"line-number"},[e._v("22")]),a("br"),a("span",{staticClass:"line-number"},[e._v("23")]),a("br"),a("span",{staticClass:"line-number"},[e._v("24")]),a("br"),a("span",{staticClass:"line-number"},[e._v("25")]),a("br"),a("span",{staticClass:"line-number"},[e._v("26")]),a("br"),a("span",{staticClass:"line-number"},[e._v("27")]),a("br"),a("span",{staticClass:"line-number"},[e._v("28")]),a("br"),a("span",{staticClass:"line-number"},[e._v("29")]),a("br"),a("span",{staticClass:"line-number"},[e._v("30")]),a("br"),a("span",{staticClass:"line-number"},[e._v("31")]),a("br"),a("span",{staticClass:"line-number"},[e._v("32")]),a("br"),a("span",{staticClass:"line-number"},[e._v("33")]),a("br"),a("span",{staticClass:"line-number"},[e._v("34")]),a("br"),a("span",{staticClass:"line-number"},[e._v("35")]),a("br"),a("span",{staticClass:"line-number"},[e._v("36")]),a("br"),a("span",{staticClass:"line-number"},[e._v("37")]),a("br"),a("span",{staticClass:"line-number"},[e._v("38")]),a("br"),a("span",{staticClass:"line-number"},[e._v("39")]),a("br"),a("span",{staticClass:"line-number"},[e._v("40")]),a("br")])]),a("h2",{attrs:{id:"database-management-statement"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#database-management-statement"}},[e._v("#")]),e._v(" Database Management Statement")]),e._v(" "),a("ul",[a("li",[e._v("Create User")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("CREATE USER <userName> <password>; 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 \nprivileges:= string (COMMA string)*  \nroleName:= identifier  \nnodeName:=identifier (DOT identifier)*\nEg: IoTDB > REVOKE ROLE temprole PRIVILEGES 'DELETE_TIMESERIES' ON root.ln;\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br")])]),a("ul",[a("li",[e._v("Revoke Role From User")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("REVOKE <roleName> FROM <userName>;\nroleName:=identifier\nuserName:=identifier\nEg: IoTDB > REVOKE temprole FROM tempuser;\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br")])]),a("ul",[a("li",[e._v("List Users")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("LIST USER\nEg: IoTDB > LIST USER\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br")])]),a("ul",[a("li",[e._v("List Roles")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("LIST ROLE\nEg: IoTDB > LIST ROLE\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br")])]),a("ul",[a("li",[e._v("List Privileges")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("LIST PRIVILEGES USER  <username> ON <path>; 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 \nusername:=identifier\nEg: IoTDB > LIST ALL ROLE OF USER tempuser;\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("List Users of Role")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("LIST ALL USER OF ROLE <roleName>;\nroleName:=identifier\nEg: IoTDB > LIST ALL USER OF ROLE roleuser;\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("Alter Password")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("ALTER USER <username> SET PASSWORD <password>;\nroleName:=identifier\npassword:=identifier\nEg: IoTDB > ALTER USER tempuser SET PASSWORD 'newpwd';\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br")])]),a("h2",{attrs:{id:"functions"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#functions"}},[e._v("#")]),e._v(" Functions")]),e._v(" "),a("ul",[a("li",[e._v("COUNT")])]),e._v(" "),a("p",[e._v("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.")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SELECT COUNT(Path) (COMMA COUNT(Path))* FROM <FromClause> [WHERE <WhereClause>]?\nEg. SELECT COUNT(status), COUNT(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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("FIRST_VALUE(Rename from "),a("code",[e._v("FIRST")]),e._v(" at "),a("code",[e._v("V0.10.0")]),e._v(")")])]),e._v(" "),a("p",[e._v("The FIRST_VALUE function returns the first point value of the choosen timeseries(one or more).")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SELECT FIRST_VALUE (Path) (COMMA FIRST_VALUE (Path))* FROM <FromClause> [WHERE <WhereClause>]?\nEg. SELECT FIRST_VALUE (status), FIRST_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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("LAST_VALUE")])]),e._v(" "),a("p",[e._v("The LAST_VALUE function returns the last point value of the choosen timeseries(one or more).")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SELECT LAST_VALUE (Path) (COMMA LAST_VALUE (Path))* FROM <FromClause> [WHERE <WhereClause>]?\nEg. 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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("MAX_TIME")])]),e._v(" "),a("p",[e._v("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.")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("MAX_VALUE")])]),e._v(" "),a("p",[e._v("The MAX_VALUE function returns the maximum value(lexicographically ordered) of the choosen timeseries (one or more).")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("AVG(Rename from "),a("code",[e._v("MEAN")]),e._v(" at "),a("code",[e._v("V0.9.0")]),e._v(")")])]),e._v(" "),a("p",[e._v("The AVG function returns the arithmetic mean value of the choosen timeseries over a specified period of time. The timeseries must be int32, int64, float, double type, and the other types are not to be calculated. The result is a double type number.")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("MIN_TIME")])]),e._v(" "),a("p",[e._v("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.")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("MIN_VALUE")])]),e._v(" "),a("p",[e._v("The MIN_VALUE function returns the minimum value(lexicographically ordered) of the choosen timeseries (one or more).")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("NOW")])]),e._v(" "),a("p",[e._v("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.")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("NOW()\nEg. INSERT INTO root.ln.wf01.wt01(timestamp,status) VALUES(NOW(), false)\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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br")])]),a("ul",[a("li",[e._v("SUM")])]),e._v(" "),a("p",[e._v("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.")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("h2",{attrs:{id:"ttl"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#ttl"}},[e._v("#")]),e._v(" TTL")]),e._v(" "),a("p",[e._v("IoTDB supports storage-level TTL settings, which means it is able to delete old data\nautomatically and periodically. The benefit of using TTL is that hopefully you can control the\ntotal disk space usage and prevent the machine from running out of disks. Moreover, the query\nperformance may downgrade as the total number of files goes up and the memory usage also increase\nas there are more files. Timely removing such files helps to keep at a high query performance\nlevel and reduce memory usage. The TTL operations in IoTDB are supported by the following three\nstatements:")]),e._v(" "),a("ul",[a("li",[e._v("Set TTL")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SET TTL TO StorageGroupName TTLTime\nEg. SET TTL TO root.group1 3600000\nThis example means that for data in root.group1, only that of the latest 1 hour will remain, the\nolder one is removed or made invisible. \nNote: TTLTime should be millisecond timestamp. When TTL is set, insertions that fall\nout of TTL will be rejected.\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br")])]),a("ul",[a("li",[e._v("Unset TTL")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("UNSET TTL TO StorageGroupName\nEg. UNSET TTL TO root.group1\nThis example means that data of all time will be accepted in this group. \n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("ul",[a("li",[e._v("Show TTL")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v('SHOW ALL TTL\nSHOW TTL ON StorageGroupNames\nEg.1 SHOW ALL TTL\nThis example will show TTLs of all storage groups.\nEg.2 SHOW TTL ON root.group1,root.group2,root.group3\nThis example will show TTLs of the specified 3 groups.\nNotice: storage groups without TTL will show a "null"\n')])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br")])]),a("p",[e._v("Notice: When you set TTL to some storage groups, data out of the TTL will be made invisible\nimmediately, but because the data files may contain both out-dated and living data or the data files may\nbe being used by queries, the physical removal of data is stale. If you increase or unset TTL\njust after setting it previously, some previously invisible data may be seen again, but the\nphysically removed one is lost forever. In other words, different from delete statement, the\natomicity of data deletion is not guaranteed for efficiency concerns. So we recommend that you do\nnot change the TTL once it is set or at least do not reset it frequently, unless you are determined\nto suffer the unpredictability.")]),e._v(" "),a("ul",[a("li",[e._v("Delete Partition (experimental)")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("DELETE PARTITION StorageGroupName INT(COMMA INT)*\nEg DELETE PARTITION root.sg1 0,1,2\nThis example will delete the first 3 time partitions of storage group root.sg1.\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("p",[e._v("The partitionId can be found in data folders or converted using "),a("code",[e._v("timestamp / partitionInterval")]),e._v(".")]),e._v(" "),a("h2",{attrs:{id:"performance-tracing"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#performance-tracing"}},[e._v("#")]),e._v(" Performance Tracing")]),e._v(" "),a("p",[e._v("IoTDB supports tracking the execution of query statements by using "),a("code",[e._v("TRACING")]),e._v(" statements. The number of tsfile files and chunks accessed by the query etc are output through the log file. The default output location is in "),a("code",[e._v("./data/tracing")]),e._v(". The performance tracing function is turned off by default. Users can use the TRACING ON/OFF command to turn this function on/off.")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("TRACING ON    // Open performance tracing\nTRACING OFF   // Close performance tracing\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br")])]),a("h2",{attrs:{id:"kill-query"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#kill-query"}},[e._v("#")]),e._v(" Kill query")]),e._v(" "),a("ul",[a("li",[e._v("Show the list of queries in progress")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("SHOW QUERY PROCESSLIST\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br")])]),a("ul",[a("li",[e._v("Kill query")])]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("KILL QUERY INT?\nE.g. KILL QUERY\nE.g. KILL QUERY 2\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br")])]),a("h1",{attrs:{id:"reference"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#reference"}},[e._v("#")]),e._v(" Reference")]),e._v(" "),a("h2",{attrs:{id:"identifiers"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#identifiers"}},[e._v("#")]),e._v(" Identifiers")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("QUOTE := '\\'';\nDOT := '.';\nCOLON : ':' ;\nCOMMA := ',' ;\nSEMICOLON := ';' ;\nLPAREN := '(' ;\nRPAREN := ')' ;\nLBRACKET := '[';\nRBRACKET := ']';\nEQUAL := '=' | '==';\nNOTEQUAL := '<>' | '!=';\nLESSTHANOREQUALTO := '<=';\nLESSTHAN := '<';\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")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br"),a("span",{staticClass:"line-number"},[e._v("9")]),a("br"),a("span",{staticClass:"line-number"},[e._v("10")]),a("br"),a("span",{staticClass:"line-number"},[e._v("11")]),a("br"),a("span",{staticClass:"line-number"},[e._v("12")]),a("br"),a("span",{staticClass:"line-number"},[e._v("13")]),a("br"),a("span",{staticClass:"line-number"},[e._v("14")]),a("br"),a("span",{staticClass:"line-number"},[e._v("15")]),a("br"),a("span",{staticClass:"line-number"},[e._v("16")]),a("br"),a("span",{staticClass:"line-number"},[e._v("17")]),a("br"),a("span",{staticClass:"line-number"},[e._v("18")]),a("br"),a("span",{staticClass:"line-number"},[e._v("19")]),a("br"),a("span",{staticClass:"line-number"},[e._v("20")]),a("br"),a("span",{staticClass:"line-number"},[e._v("21")]),a("br"),a("span",{staticClass:"line-number"},[e._v("22")]),a("br"),a("span",{staticClass:"line-number"},[e._v("23")]),a("br"),a("span",{staticClass:"line-number"},[e._v("24")]),a("br")])]),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("StringLiteral := ( '\\'' ( ~('\\'') )* '\\'' | '\\\"' ( ~('\\\"') )* '\\\"');\neg. 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