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root.sg.d1.s2|\n+-----------------------------+-------------+--------------+-------------+-------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+-----------------------------+\n|1970-01-01T08:00:00.001+08:00|          1.0|          -1.0|          1.0|          1.0|                          2.0|                          0.0|                          1.0|                          1.0|                          0.0|\n|1970-01-01T08:00:00.002+08:00|          2.0|          -2.0|          2.0|          2.0|                          4.0|                          0.0|                          4.0|                          1.0|                          0.0|\n|1970-01-01T08:00:00.003+08:00|          3.0|          -3.0|          3.0|          3.0|                          6.0|                          0.0|                          9.0|                          1.0|                          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root.test.b)|\n+-----------------------------+-----------+-----------+----------------+--------------------------+---------------------------+------------------------------------------------+\n|1970-01-01T08:00:00.001+08:00|         23|       10.0|            true|                     false|                       true|                                            true|\n|1970-01-01T08:00:00.002+08:00|         33|       21.0|            true|                     false|                       true|                                            true|\n|1970-01-01T08:00:00.004+08:00|         13|       15.0|            true|                      true|                      false|                                           false|\n|1970-01-01T08:00:00.005+08:00|         26|        0.0|            true|                     false|                       true|                                            true|\n|1970-01-01T08:00:00.008+08:00|          1|       22.0|           false|                      true|                      false|                                           false|\n|1970-01-01T08:00:00.010+08:00|         23|       12.0|            true|                     false|                       true|                                            true|\n+-----------------------------+-----------+-----------+----------------+--------------------------+---------------------------+------------------------------------------------+\n")])]),s._v(" 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punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" non_negative_difference"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("s1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" derivative"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("s1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" non_negative_derivative"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("s1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("sg1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("d1 "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("limit")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("5")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("offset")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("1000")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v(" \n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("结果：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("+-----------------------------+-------------------+-------------------------------+--------------------------+---------------------------------------+--------------------------+---------------------------------------+\n|                         Time|     root.sg1.d1.s1|time_difference(root.sg1.d1.s1)|difference(root.sg1.d1.s1)|non_negative_difference(root.sg1.d1.s1)|derivative(root.sg1.d1.s1)|non_negative_derivative(root.sg1.d1.s1)|\n+-----------------------------+-------------------+-------------------------------+--------------------------+---------------------------------------+--------------------------+---------------------------------------+\n|2020-12-10T17:11:49.037+08:00|7360723084922759782|                              1|      -8431715764844238876|                    8431715764844238876|    -8.4317157648442388E18|                  8.4317157648442388E18|\n|2020-12-10T17:11:49.038+08:00|4377791063319964531|                              1|      -2982932021602795251|                    2982932021602795251|     -2.982932021602795E18|                   2.982932021602795E18|\n|2020-12-10T17:11:49.039+08:00|7972485567734642915|                              1|       3594694504414678384|                    3594694504414678384|     3.5946945044146785E18|                  3.5946945044146785E18|\n|2020-12-10T17:11:49.040+08:00|2508858212791964081|                              1|      -5463627354942678834|                    5463627354942678834|     -5.463627354942679E18|                   5.463627354942679E18|\n|2020-12-10T17:11:49.041+08:00|2817297431185141819|                              1|        308439218393177738|                     308439218393177738|     3.0843921839317773E17|                  3.0843921839317773E17|\n+-----------------------------+-------------------+-------------------------------+--------------------------+---------------------------------------+--------------------------+---------------------------------------+\nTotal line number = 5\nIt costs 0.014s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br")])]),t("h3",{attrs:{id:"常序列生成函数"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#常序列生成函数"}},[s._v("#")]),s._v(" 常序列生成函数")]),s._v(" "),t("p",[s._v("常序列生成函数用于生成所有数据点的值都相同的时间序列。")]),s._v(" "),t("p",[s._v("常序列生成函数接受一个或者多个时间序列输入，其输出的数据点的时间戳集合是这些输入序列时间戳集合的并集。")]),s._v(" "),t("p",[s._v("目前 IoTDB 支持如下常序列生成函数：")]),s._v(" "),t("table",[t("thead",[t("tr",[t("th",[s._v("函数名")]),s._v(" "),t("th",[s._v("必要的属性参数")]),s._v(" "),t("th",[s._v("输出序列类型")]),s._v(" "),t("th",[s._v("功能描述")])])]),s._v(" "),t("tbody",[t("tr",[t("td",[s._v("CONST")]),s._v(" "),t("td",[t("code",[s._v("value")]),s._v(": 输出的数据点的值 "),t("br"),t("code",[s._v("type")]),s._v(": 输出的数据点的类型，只能是 INT32 / INT64 / FLOAT / DOUBLE / BOOLEAN / TEXT")]),s._v(" "),t("td",[s._v("由输入属性参数 "),t("code",[s._v("type")]),s._v(" 决定")]),s._v(" "),t("td",[s._v("根据输入属性 "),t("code",[s._v("value")]),s._v(" 和 "),t("code",[s._v("type")]),s._v(" 输出用户指定的常序列。")])]),s._v(" "),t("tr",[t("td",[s._v("PI")]),s._v(" "),t("td",[s._v("无")]),s._v(" "),t("td",[s._v("DOUBLE")]),s._v(" "),t("td",[s._v("常序列的值："),t("code",[s._v("π")]),s._v(" 的 "),t("code",[s._v("double")]),s._v(" 值，圆的周长与其直径的比值，即圆周率，等于 "),t("em",[s._v("Java标准库")]),s._v(" 中的"),t("code",[s._v("Math.PI")]),s._v("。")])]),s._v(" "),t("tr",[t("td",[s._v("E")]),s._v(" "),t("td",[s._v("无")]),s._v(" "),t("td",[s._v("DOUBLE")]),s._v(" "),t("td",[s._v("常序列的值："),t("code",[s._v("e")]),s._v(" 的 "),t("code",[s._v("double")]),s._v(" 值，自然对数的底，它等于 "),t("em",[s._v("Java 标准库")]),s._v("  中的 "),t("code",[s._v("Math.E")]),s._v("。")])])])]),s._v(" "),t("p",[s._v("例如：")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("select")]),s._v(" s1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" s2"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" const"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("s1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'value'")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'1024'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'type'")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'INT64'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" pi"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("s2"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" e"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("s1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" s2"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("sg1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("d1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v(" \n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("结果：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("select s1, s2, const(s1, 'value'='1024', 'type'='INT64'), pi(s2), e(s1, s2) from root.sg1.d1; \n+-----------------------------+--------------+--------------+-----------------------------------------------------+------------------+---------------------------------+\n|                         Time|root.sg1.d1.s1|root.sg1.d1.s2|const(root.sg1.d1.s1, \"value\"=\"1024\", \"type\"=\"INT64\")|pi(root.sg1.d1.s2)|e(root.sg1.d1.s1, root.sg1.d1.s2)|\n+-----------------------------+--------------+--------------+-----------------------------------------------------+------------------+---------------------------------+\n|1970-01-01T08:00:00.000+08:00|           0.0|           0.0|                                                 1024| 3.141592653589793|                2.718281828459045|\n|1970-01-01T08:00:00.001+08:00|           1.0|          null|                                                 1024|              null|                2.718281828459045|\n|1970-01-01T08:00:00.002+08:00|           2.0|          null|                                                 1024|              null|                2.718281828459045|\n|1970-01-01T08:00:00.003+08:00|          null|           3.0|                                                 null| 3.141592653589793|                2.718281828459045|\n|1970-01-01T08:00:00.004+08:00|          null|           4.0|                                                 null| 3.141592653589793|                2.718281828459045|\n+-----------------------------+--------------+--------------+-----------------------------------------------------+------------------+---------------------------------+\nTotal line number = 5\nIt costs 0.005s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br")])]),t("h3",{attrs:{id:"数据类型转换函数"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#数据类型转换函数"}},[s._v("#")]),s._v(" 数据类型转换函数")]),s._v(" "),t("p",[s._v("当前IoTDB支持6种数据类型，其中包括INT32、INT64、FLOAT、DOUBLE、BOOLEAN以及TEXT。当我们对数据进行查询或者计算时可能需要进行数据类型的转换， 比如说将TEXT转换为INT32，或者提高数据精度，比如说将FLOAT转换为DOUBLE。所以，IoTDB支持使用cast函数对数据类型进行转换。")]),s._v(" "),t("table",[t("thead",[t("tr",[t("th",[s._v("函数名")]),s._v(" "),t("th",[s._v("必要的属性参数")]),s._v(" "),t("th",[s._v("输出序列类型")]),s._v(" "),t("th",[s._v("功能类型")])])]),s._v(" "),t("tbody",[t("tr",[t("td",[s._v("CAST")]),s._v(" "),t("td",[t("code",[s._v("type")]),s._v(":输出的数据点的类型，只能是 INT32 / INT64 / FLOAT / DOUBLE / BOOLEAN / TEXT")]),s._v(" "),t("td",[s._v("由输入属性参数"),t("code",[s._v("type")]),s._v("决定")]),s._v(" "),t("td",[s._v("将数据转换为"),t("code",[s._v("type")]),s._v("参数指定的类型。")])])])]),s._v(" "),t("h5",{attrs:{id:"类型转换说明"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#类型转换说明"}},[s._v("#")]),s._v(" 类型转换说明")]),s._v(" "),t("p",[s._v('1.当INT32、INT64类型的值不为0时，FLOAT与DOUBLE类型的值不为0.0时，TEXT类型不为空字符串或者"false"时，转换为BOOLEAN类型时值为true，否则为false。')]),s._v(" "),t("p",[s._v('2.当BOOLEAN类型的值为true时，转换为INT32与INT64类型的值为1，转换为FLOAT或者DOUBLE类型时值为1.0，转换为TEXT类型时值为"true"。当BOOLEAN类型的值为false时，转换为INT32与INT64类型的值为0，转换为FLOAT或者DOUBLE类型时值为0.0，转换为TEXT类型时值为"false"。')]),s._v(" "),t("p",[s._v("3.当TEXT类型转换为INT32、INT64、FLOAT类型时，会先将TEXT类型的数据转换为DOUBLE类型，然后再转换为对应的类型，此时可能会存在损失精度的问题。如果无法转换的话则直接跳过。")]),s._v(" "),t("h5",{attrs:{id:"演示"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#演示"}},[s._v("#")]),s._v(" 演示")]),s._v(" "),t("p",[s._v("测试数据：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("IoTDB> select text from root.test;\n+-----------------------------+--------------+\n|                         Time|root.test.text|\n+-----------------------------+--------------+\n|1970-01-01T08:00:00.001+08:00|           1.1|\n|1970-01-01T08:00:00.002+08:00|             1|\n|1970-01-01T08:00:00.003+08:00|   hello world|\n|1970-01-01T08:00:00.004+08:00|         false|\n+-----------------------------+--------------+\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br")])]),t("p",[s._v("SQL语句：")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("select")]),s._v(" cast"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("text")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'type'")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'BOOLEAN'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" cast"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("text")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'type'")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'INT32'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" cast"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("text")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'type'")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'INT64'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" cast"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("text")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'type'")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'FLOAT'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" cast"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("text")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'type'")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'DOUBLE'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("test"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("结果：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v('+-----------------------------+--------------------------------------+------------------------------------+------------------------------------+------------------------------------+-------------------------------------+\n|                         Time|cast(root.test.text, "type"="BOOLEAN")|cast(root.test.text, "type"="INT32")|cast(root.test.text, "type"="INT64")|cast(root.test.text, "type"="FLOAT")|cast(root.test.text, "type"="DOUBLE")|\n+-----------------------------+--------------------------------------+------------------------------------+------------------------------------+------------------------------------+-------------------------------------+\n|1970-01-01T08:00:00.001+08:00|                                  true|                                   1|                                   1|                                 1.1|                                  1.1|\n|1970-01-01T08:00:00.002+08:00|                                  true|                                   1|                                   1|                                 1.0|                                  1.0|\n|1970-01-01T08:00:00.003+08:00|                                  true|                                null|                                null|                                null|                                 null|\n|1970-01-01T08:00:00.004+08:00|                                 false|                                null|                                null|                                null|                                 null|\n+-----------------------------+--------------------------------------+------------------------------------+------------------------------------+------------------------------------+-------------------------------------+\nTotal line number = 4\nIt costs 0.078s\n')])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br")])]),t("h3",{attrs:{id:"条件函数"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#条件函数"}},[s._v("#")]),s._v(" 条件函数")]),s._v(" "),t("p",[s._v("条件函数针对每个数据点进行条件判断，返回布尔值")]),s._v(" "),t("p",[s._v("目前IoTDB支持以下条件函数")]),s._v(" "),t("table",[t("thead",[t("tr",[t("th",[s._v("函数名")]),s._v(" "),t("th",[s._v("可接收的输入序列类型")]),s._v(" "),t("th",[s._v("必要的属性参数")]),s._v(" "),t("th",[s._v("输出序列类型")]),s._v(" "),t("th",[s._v("功能类型")])])]),s._v(" "),t("tbody",[t("tr",[t("td",[s._v("ON_OFF")]),s._v(" "),t("td",[s._v("INT32 / INT64 / FLOAT / DOUBLE")]),s._v(" "),t("td",[t("code",[s._v("threshold")]),s._v(":DOUBLE类型")]),s._v(" "),t("td",[s._v("BOOLEAN 类型")]),s._v(" "),t("td",[s._v("返回"),t("code",[s._v("ts_value >= threshold")]),s._v("的bool值")])]),s._v(" "),t("tr",[t("td",[s._v("IN_RANGE")]),s._v(" "),t("td",[s._v("INT32 / INT64 / FLOAT / DOUBLE")]),s._v(" "),t("td",[t("code",[s._v("lower")]),s._v(":DOUBLE类型"),t("br"),t("code",[s._v("upper")]),s._v(":DOUBLE类型")]),s._v(" "),t("td",[s._v("BOOLEAN类型")]),s._v(" "),t("td",[s._v("返回"),t("code",[s._v("ts_value >= lower && ts_value <= upper")]),s._v("的bool值")])])])]),s._v(" "),t("p",[s._v("测试数据：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("IoTDB> select ts from root.test;\n+-----------------------------+------------+\n|                         Time|root.test.ts|\n+-----------------------------+------------+\n|1970-01-01T08:00:00.001+08:00|           1|\n|1970-01-01T08:00:00.002+08:00|           2|\n|1970-01-01T08:00:00.003+08:00|           3|\n|1970-01-01T08:00:00.004+08:00|           4|\n+-----------------------------+------------+\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br")])]),t("h5",{attrs:{id:"测试1"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#测试1"}},[s._v("#")]),s._v(" 测试1")]),s._v(" "),t("p",[s._v("SQL语句：")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("select")]),s._v(" ts"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" on_off"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("ts"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'threshold'")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'2'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("test"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("输出：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("IoTDB> select ts, on_off(ts, 'threshold'='2') from root.test;\n+-----------------------------+------------+-------------------------------------+\n|                         Time|root.test.ts|on_off(root.test.ts, \"threshold\"=\"2\")|\n+-----------------------------+------------+-------------------------------------+\n|1970-01-01T08:00:00.001+08:00|           1|                                false|\n|1970-01-01T08:00:00.002+08:00|           2|                                 true|\n|1970-01-01T08:00:00.003+08:00|           3|                                 true|\n|1970-01-01T08:00:00.004+08:00|           4|                                 true|\n+-----------------------------+------------+-------------------------------------+\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br")])]),t("h5",{attrs:{id:"测试2"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#测试2"}},[s._v("#")]),s._v(" 测试2")]),s._v(" "),t("p",[s._v("Sql语句：")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("select")]),s._v(" ts"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" in_range"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("ts"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'lower'")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'2'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'upper'")]),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),t("span",{pre:!0,attrs:{class:"token string"}},[s._v("'3.1'")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("test"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("输出：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("IoTDB> select ts, in_range(ts, 'lower'='2', 'upper'='3.1') from root.test;\n+-----------------------------+------------+--------------------------------------------------+\n|                         Time|root.test.ts|in_range(root.test.ts, \"lower\"=\"2\", \"upper\"=\"3.1\")|\n+-----------------------------+------------+--------------------------------------------------+\n|1970-01-01T08:00:00.001+08:00|           1|                                             false|\n|1970-01-01T08:00:00.002+08:00|           2|                                              true|\n|1970-01-01T08:00:00.003+08:00|           3|                                              true|\n|1970-01-01T08:00:00.004+08:00|           4|                                             false|\n+-----------------------------+------------+--------------------------------------------------+\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br")])]),t("h3",{attrs:{id:"连续满足区间函数"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#连续满足区间函数"}},[s._v("#")]),s._v(" 连续满足区间函数")]),s._v(" "),t("p",[s._v("连续满足条件区间函数用来查询所有满足指定条件的连续区间。\n按返回值可分为两类：")]),s._v(" "),t("ol",[t("li",[s._v("返回满足条件连续区间的起始时间戳和时间跨度(时间跨度为0表示此处只有起始时间这一个数据点满足条件)")]),s._v(" "),t("li",[s._v("返回满足条件连续区间的起始时间戳和后面连续满足条件的点的个数（个数为1表示此处只有起始时间这一个数据点满足条件）")])]),s._v(" "),t("table",[t("thead",[t("tr",[t("th",[s._v("函数名")]),s._v(" "),t("th",[s._v("输入序列类型")]),s._v(" "),t("th",[s._v("属性参数")]),s._v(" "),t("th",[s._v("输出序列类型")]),s._v(" "),t("th",[s._v("功能描述")])])]),s._v(" "),t("tbody",[t("tr",[t("td",[s._v("ZERO_DURATION")]),s._v(" "),t("td",[s._v("INT32/ INT64/ FLOAT/ DOUBLE/ BOOLEAN")]),s._v(" "),t("td",[t("code",[s._v("min")]),s._v(":可选，默认值0"),t("br"),t("code",[s._v("max")]),s._v(":可选，默认值"),t("code",[s._v("Long.MAX_VALUE")])]),s._v(" "),t("td",[s._v("Long")]),s._v(" "),t("td",[s._v("返回时间序列连续为0(false)的开始时间与持续时间，持续时间t(单位ms)满足"),t("code",[s._v("t >= min && t <= max")])])]),s._v(" "),t("tr",[t("td",[s._v("NON_ZERO_DURATION")]),s._v(" "),t("td",[s._v("INT32/ INT64/ FLOAT/ DOUBLE/ BOOLEAN")]),s._v(" "),t("td",[t("code",[s._v("min")]),s._v(":可选，默认值0"),t("br"),t("code",[s._v("max")]),s._v(":可选，默认值"),t("code",[s._v("Long.MAX_VALUE")])]),s._v(" "),t("td",[s._v("Long")]),s._v(" "),t("td",[s._v("返回时间序列连续不为0(false)的开始时间与持续时间，持续时间t(单位ms)满足"),t("code",[s._v("t >= min && t <= max")])])]),s._v(" "),t("tr",[t("td",[s._v("ZERO_COUNT")]),s._v(" "),t("td",[s._v("INT32/ INT64/ FLOAT/ DOUBLE/ BOOLEAN")]),s._v(" "),t("td",[t("code",[s._v("min")]),s._v(":可选，默认值1"),t("br"),t("code",[s._v("max")]),s._v(":可选，默认值"),t("code",[s._v("Long.MAX_VALUE")])]),s._v(" "),t("td",[s._v("Long")]),s._v(" "),t("td",[s._v("返回时间序列连续为0(false)的开始时间与其后数据点的个数，数据点个数n满足"),t("code",[s._v("n >= min && n <= max")])])]),s._v(" "),t("tr",[t("td",[s._v("NON_ZERO_COUNT")]),s._v(" "),t("td",[s._v("INT32/ INT64/ FLOAT/ DOUBLE/ BOOLEAN")]),s._v(" "),t("td",[t("code",[s._v("min")]),s._v(":可选，默认值1"),t("br"),t("code",[s._v("max")]),s._v(":可选，默认值"),t("code",[s._v("Long.MAX_VALUE")])]),s._v(" "),t("td",[s._v("Long")]),s._v(" "),t("td",[s._v("返回时间序列连续不为0(false)的开始时间与其后数据点的个数，数据点个数n满足"),t("code",[s._v("n >= min && n <= max")])])])])]),s._v(" "),t("h5",{attrs:{id:"演示-2"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#演示-2"}},[s._v("#")]),s._v(" 演示")]),s._v(" "),t("p",[s._v("测试数据:")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("IoTDB> select s1,s2,s3,s4,s5 from root.sg.d2;\n+-----------------------------+-------------+-------------+-------------+-------------+-------------+\n|                         Time|root.sg.d2.s1|root.sg.d2.s2|root.sg.d2.s3|root.sg.d2.s4|root.sg.d2.s5|\n+-----------------------------+-------------+-------------+-------------+-------------+-------------+\n|1970-01-01T08:00:00.000+08:00|            0|            0|          0.0|          0.0|        false|\n|1970-01-01T08:00:00.001+08:00|            1|            1|          1.0|          1.0|         true|\n|1970-01-01T08:00:00.002+08:00|            1|            1|          1.0|          1.0|         true|\n|1970-01-01T08:00:00.003+08:00|            0|            0|          0.0|          0.0|        false|\n|1970-01-01T08:00:00.004+08:00|            1|            1|          1.0|          1.0|         true|\n|1970-01-01T08:00:00.005+08:00|            0|            0|          0.0|          0.0|        false|\n|1970-01-01T08:00:00.006+08:00|            0|            0|          0.0|          0.0|        false|\n|1970-01-01T08:00:00.007+08:00|            1|            1|          1.0|          1.0|         true|\n+-----------------------------+-------------+-------------+-------------+-------------+-------------+\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br")])]),t("p",[s._v("sql:")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("select")]),s._v(" s1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" zero_count"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("s1"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" non_zero_count"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("s2"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" zero_duration"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("s3"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" non_zero_duration"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("s4"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("sg"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("d2"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("结果:")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("+-----------------------------+-------------+-------------------------+-----------------------------+----------------------------+--------------------------------+\n|                         Time|root.sg.d2.s1|zero_count(root.sg.d2.s1)|non_zero_count(root.sg.d2.s2)|zero_duration(root.sg.d2.s3)|non_zero_duration(root.sg.d2.s4)|\n+-----------------------------+-------------+-------------------------+-----------------------------+----------------------------+--------------------------------+\n|1970-01-01T08:00:00.000+08:00|            0|                        1|                         null|                           0|                            null|\n|1970-01-01T08:00:00.001+08:00|            1|                     null|                            2|                        null|                               1|\n|1970-01-01T08:00:00.002+08:00|            1|                     null|                         null|                        null|                            null|\n|1970-01-01T08:00:00.003+08:00|            0|                        1|                         null|                           0|                            null|\n|1970-01-01T08:00:00.004+08:00|            1|                     null|                            1|                        null|                               0|\n|1970-01-01T08:00:00.005+08:00|            0|                        2|                         null|                           1|                            null|\n|1970-01-01T08:00:00.006+08:00|            0|                     null|                         null|                        null|                            null|\n|1970-01-01T08:00:00.007+08:00|            1|                     null|                            1|                        null|                               0|\n+-----------------------------+-------------+-------------------------+-----------------------------+----------------------------+--------------------------------+\n")])]),s._v(" 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6.0|\n|1970-01-01T08:00:00.007+08:00|                          7.0|\n|1970-01-01T08:00:00.008+08:00|                          8.0|\n|1970-01-01T08:00:00.009+08:00|                          9.0|\n|1970-01-01T08:00:00.010+08:00|                         10.0|\n|1970-01-01T08:00:00.011+08:00|                         11.0|\n|1970-01-01T08:00:00.012+08:00|                         12.0|\n|.............................|.............................|            \n|1970-01-01T08:00:00.089+08:00|                         89.0|\n|1970-01-01T08:00:00.090+08:00|                         90.0|\n|1970-01-01T08:00:00.091+08:00|                         91.0|\n|1970-01-01T08:00:00.092+08:00|                         92.0|\n|1970-01-01T08:00:00.093+08:00|                         93.0|\n|1970-01-01T08:00:00.094+08:00|                         94.0|\n|1970-01-01T08:00:00.095+08:00|                         95.0|\n|1970-01-01T08:00:00.096+08:00|                         96.0|\n|1970-01-01T08:00:00.097+08:00|                         97.0|\n|1970-01-01T08:00:00.098+08:00|                         98.0|\n|1970-01-01T08:00:00.099+08:00|                         99.0|\n+-----------------------------+-----------------------------+\n")])]),s._v(" 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96.0|\n+-----------------------------+-------------+\nTotal line number = 10\nIt costs 0.024s\n")])]),s._v(" 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80.0|\n|1970-01-01T08:00:00.081+08:00|     81.0|\n|1970-01-01T08:00:00.098+08:00|     98.0|\n|1970-01-01T08:00:00.099+08:00|     99.0|\n+-----------------------------+---------+\nTotal line number = 12\nIt costs 0.065s\n")])]),s._v(" 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4.0|\n|1970-01-01T08:00:00.005+08:00|                        105.0|\n|1970-01-01T08:00:00.006+08:00|                          6.0|\n|1970-01-01T08:00:00.007+08:00|                          7.0|\n|1970-01-01T08:00:00.008+08:00|                          8.0|\n|1970-01-01T08:00:00.009+08:00|                          9.0|\n|1970-01-01T08:00:00.010+08:00|                         10.0|\n|1970-01-01T08:00:00.011+08:00|                         11.0|\n|1970-01-01T08:00:00.012+08:00|                         12.0|\n|1970-01-01T08:00:00.013+08:00|                         13.0|\n|1970-01-01T08:00:00.014+08:00|                         14.0|\n|1970-01-01T08:00:00.015+08:00|                        115.0|\n|1970-01-01T08:00:00.016+08:00|                         16.0|\n|.............................|.............................|\n|1970-01-01T08:00:00.092+08:00|                         92.0|\n|1970-01-01T08:00:00.093+08:00|                         93.0|\n|1970-01-01T08:00:00.094+08:00|                         94.0|\n|1970-01-01T08:00:00.095+08:00|                        195.0|\n|1970-01-01T08:00:00.096+08:00|                         96.0|\n|1970-01-01T08:00:00.097+08:00|                         97.0|\n|1970-01-01T08:00:00.098+08:00|                         98.0|\n|1970-01-01T08:00:00.099+08:00|                         99.0|\n+-----------------------------+-----------------------------+\n")])]),s._v(" 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           105.0|             105.0|                    105.0|\n|1970-01-01T08:00:00.015+08:00|             115.0|                 115.0|             115.0|                    115.0|\n|1970-01-01T08:00:00.025+08:00|             125.0|                 125.0|             125.0|                    125.0|\n|1970-01-01T08:00:00.035+08:00|             135.0|                 135.0|             135.0|                    135.0|\n|1970-01-01T08:00:00.045+08:00|             145.0|                 145.0|             145.0|                    145.0|\n|1970-01-01T08:00:00.055+08:00|             155.0|                 155.0|             155.0|                    155.0|\n|1970-01-01T08:00:00.065+08:00|             165.0|                 165.0|             165.0|                    165.0|\n|1970-01-01T08:00:00.075+08:00|             175.0|                 175.0|             175.0|                    175.0|\n|1970-01-01T08:00:00.085+08:00|             185.0|                 185.0|             185.0|                    185.0|\n|1970-01-01T08:00:00.095+08:00|             195.0|                 195.0|             195.0|                    195.0|\n+-----------------------------+------------------+----------------------+------------------+-------------------------+\nTotal line number = 10\nIt costs 0.041s\n")])]),s._v(" 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Time|root.ln.wf01.wt01.str|root.ln.wf01.wt01.st|root.ln.wf01.wt01.temperature|\n+-----------------------------+---------------------+--------------------+-----------------------------+\n|1970-01-01T08:00:00.000+08:00|                  str|                10.0|                          0.0|\n|1970-01-01T08:00:00.001+08:00|                  str|                20.0|                          1.0|\n|1970-01-01T08:00:00.002+08:00|                  str|                30.0|                          2.0|\n|1970-01-01T08:00:00.003+08:00|                  str|                40.0|                          3.0|\n|1970-01-01T08:00:00.004+08:00|                  str|                50.0|                          4.0|\n|1970-01-01T08:00:00.005+08:00|                  str|                60.0|                          5.0|\n|1970-01-01T08:00:00.006+08:00|                  str|                70.0|                          6.0|\n|1970-01-01T08:00:00.007+08:00|                  str|                80.0|                          7.0|\n|1970-01-01T08:00:00.008+08:00|                  str|                90.0|                          8.0|\n|1970-01-01T08:00:00.009+08:00|                  str|               100.0|                          9.0|\n|1970-01-01T08:00:00.010+08:00|                  str|               110.0|                         10.0|\n+-----------------------------+---------------------+--------------------+-----------------------------+\n")])]),s._v(" 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1|\n+-----------------------------+----------+----------+----------------------------------------+---------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+\n|1970-01-01T08:00:00.010+08:00|         1|         1|                                     2.5|                                 0.9238430524420609|                                                                                                                      -1.0|\n|1970-01-01T08:00:00.020+08:00|         2|         2|                                     2.5|                                 0.7903505371876317|                                                                                                                      -3.0|\n|1970-01-01T08:00:00.030+08:00|         3|         3|                                     2.5|                                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                        39.45597888911063|\n+-----------------------------+----------------------------------------------+\nTotal line number = 9\nIt costs 0.011s\n")])]),s._v(" 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line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("+-----------------------------+---------------------------+---------------------------+---------------------------+---------------------------+\n|                         Time|(root.sg.a + root.sg.b) * 3|(root.sg.a + root.ln.b) * 3|(root.ln.a + root.sg.b) * 3|(root.ln.a + root.ln.b) * 3|\n+-----------------------------+---------------------------+---------------------------+---------------------------+---------------------------+\n|1970-01-01T08:00:00.010+08:00|                       90.0|                      270.0|                      360.0|                      540.0|\n|1970-01-01T08:00:00.020+08:00|                      150.0|                      330.0|                      690.0|                      870.0|\n|1970-01-01T08:00:00.030+08:00|                      210.0|                      450.0|                      570.0|                      810.0|\n|1970-01-01T08:00:00.040+08:00|                      270.0|                      240.0|                      690.0|                      660.0|\n|1970-01-01T08:00:00.050+08:00|                      330.0|                       null|                       null|                       null|\n|1970-01-01T08:00:00.060+08:00|                      390.0|                       null|                       null|                       null|\n|1970-01-01T08:00:00.070+08:00|                      450.0|                       null|                       null|                       null|\n|1970-01-01T08:00:00.090+08:00|                       60.0|                       null|                       null|                       null|\n|1970-01-01T08:00:00.100+08:00|                       60.0|                       null|                       null|                       null|\n+-----------------------------+---------------------------+---------------------------+---------------------------+---------------------------+\nTotal line number = 9\nIt costs 0.014s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br"),t("span",{staticClass:"line-number"},[s._v("14")]),t("br"),t("span",{staticClass:"line-number"},[s._v("15")]),t("br")])]),t("h4",{attrs:{id:"说明"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#说明"}},[s._v("#")]),s._v(" 说明")]),s._v(" "),t("ul",[t("li",[s._v("当某个时间戳下左操作数和右操作数都不为空（"),t("code",[s._v("null")]),s._v("）时，表达式才会有结果，否则表达式值为"),t("code",[s._v("null")]),s._v("，且默认不出现在结果集中。\n"),t("ul",[t("li",[s._v("从结果集1中可知，时间戳40下，时间序列"),t("code",[s._v("root.sg.a")]),s._v("的值为4，"),t("code",[s._v("root.sg.b")]),s._v("的值为"),t("code",[s._v("null")]),s._v("。所以在时间戳40下，表达式"),t("code",[s._v("(a + b) * 2 + sin(a)")]),s._v("的值为"),t("code",[s._v("null")]),s._v("，从结果集2可以看出，时间戳40没有出现。")])])]),s._v(" "),t("li",[s._v("如果表达式中某个操作数对应多条时间序列（如通配符"),t("code",[s._v("*")]),s._v("），那么每条时间序列对应的结果都会出现在结果集中（按照笛卡尔积形式）。请参考示例中输入3、4和对应结果集3、4。")])]),s._v(" "),t("h4",{attrs:{id:"注意"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#注意"}},[s._v("#")]),s._v(" 注意")]),s._v(" "),t("blockquote",[t("p",[s._v("目前对齐时间序列(Aligned Timeseries)尚不支持时间序列查询嵌套表达式。使用时间序列查询嵌套表达式时，如果操作数包含对齐时间序列，会提示错误。")])]),s._v(" "),t("h3",{attrs:{id:"聚合查询嵌套表达式"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#聚合查询嵌套表达式"}},[s._v("#")]),s._v(" 聚合查询嵌套表达式")]),s._v(" 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7441.928|\n+----------------------------------+---------------------------------------+--------------------------------------+--------------------------------+--------------------------------------------------------------------+\nTotal line number = 1\nIt costs 0.009s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br")])]),t("p",[s._v("输入2：")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("select")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token 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2) - 1|(((avg(root.sg1.b) + 1) * 3) / 2) - 1|\n+---------------+---------------+-------------------------------------+-------------------------------------+\n|            3.2|            3.4|                    5.300000000000001|                   5.6000000000000005|\n+---------------+---------------+-------------------------------------+-------------------------------------+\nTotal line number = 1\nIt costs 0.007s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br")])]),t("p",[s._v("指定 "),t("code",[s._v("GROUP BY")]),s._v(" 的聚合查询。")]),s._v(" "),t("p",[s._v("输入3：")]),s._v(" 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"),t("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token function"}},[s._v("sum")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("hardware"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("as")]),s._v(" custom_sum\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("from")]),s._v(" root"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("ln"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("wf01"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("wt01\n"),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("GROUP")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("BY")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("[")]),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("10")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("90")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token number"}},[s._v("10")]),s._v("ms"),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br")])]),t("p",[s._v("结果集3：")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("+-----------------------------+----------------------------------+---------------------------------------+--------------------------------------+--------------------------------+----------+\n|                         Time|avg(root.ln.wf01.wt01.temperature)|sin(avg(root.ln.wf01.wt01.temperature))|avg(root.ln.wf01.wt01.temperature) + 1|-sum(root.ln.wf01.wt01.hardware)|custom_sum|\n+-----------------------------+----------------------------------+---------------------------------------+--------------------------------------+--------------------------------+----------+\n|1970-01-01T08:00:00.010+08:00|                13.987499999999999|                     0.9888207947857667|                    14.987499999999999|                         -3211.0| 3224.9875|\n|1970-01-01T08:00:00.020+08:00|                              29.6|                    -0.9701057337071853|                                  30.6|                         -3720.0|    3749.6|\n|1970-01-01T08:00:00.030+08:00|                              null|                                   null|                                  null|                            null|      null|\n|1970-01-01T08:00:00.040+08:00|                              null|                                   null|                                  null|                            null|      null|\n|1970-01-01T08:00:00.050+08:00|                              null|                                   null|                                  null|                            null|      null|\n|1970-01-01T08:00:00.060+08:00|                              null|                                   null|                                  null|                            null|      null|\n|1970-01-01T08:00:00.070+08:00|                              null|                                   null|                                  null|                            null|      null|\n|1970-01-01T08:00:00.080+08:00|                              null|                                   null|                                  null|                            null|      null|\n+-----------------------------+----------------------------------+---------------------------------------+--------------------------------------+--------------------------------+----------+\nTotal line number = 8\nIt costs 0.012s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br"),t("span",{staticClass:"line-number"},[s._v("14")]),t("br")])]),t("h4",{attrs:{id:"说明-2"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#说明-2"}},[s._v("#")]),s._v(" 说明")]),s._v(" "),t("ul",[t("li",[s._v("当某个时间戳下左操作数和右操作数都不为空（"),t("code",[s._v("null")]),s._v("）时，表达式才会有结果，否则表达式值为"),t("code",[s._v("null")]),s._v("，且默认不出现在结果集中。但在使用"),t("code",[s._v("GROUP BY")]),s._v("子句的聚合查询嵌套表达式中，我们希望保留每个时间窗口的值，所以表达式值为"),t("code",[s._v("null")]),s._v("的窗口也包含在结果集中。请参考输入3及结果集3。")]),s._v(" "),t("li",[s._v("如果表达式中某个操作数对应多条时间序列（如通配符"),t("code",[s._v("*")]),s._v("），那么每条时间序列对应的结果都会出现在结果集中（按照笛卡尔积形式）。请参考输入2及结果集2。")])]),s._v(" "),t("h4",{attrs:{id:"注意-2"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#注意-2"}},[s._v("#")]),s._v(" 注意")]),s._v(" "),t("blockquote",[t("p",[s._v("目前此功能尚不支持填充算子（"),t("code",[s._v("FILL")]),s._v("）和按层级聚合（"),t("code",[s._v("GROUP BY LEVEL")]),s._v("）查询, 在后续版本会支持。")]),s._v(" "),t("p",[s._v("聚合计算目前只能当做最底层表达式输入，暂不支持聚合函数内部出现表达式。")]),s._v(" "),t("p",[s._v("即不支持以下查询")]),s._v(" "),t("div",{staticClass:"language-SQL line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token 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punctuation"}},[s._v(")")]),t("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v(" "),t("span",{pre:!0,attrs:{class:"token comment"}},[s._v("-- 空值填充 ")]),s._v("\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br")])])]),s._v(" "),t("h2",{attrs:{id:"使用别名"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#使用别名"}},[s._v("#")]),s._v(" 使用别名")]),s._v(" "),t("p",[s._v("由于 IoTDB 独特的数据模型，在每个传感器前都附带有设备等诸多额外信息。有时，我们只针对某个具体设备查询，而这些前缀信息频繁显示造成了冗余，影响了结果集的显示与分析。这时我们可以使用 IoTDB 提供的 AS 函数，将查询中出现的时间序列给定一个别名。")]),s._v(" "),t("p",[s._v("例如：")]),s._v(" "),t("div",{staticClass:"language-sql line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-sql"}},[t("code",[t("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("select")]),s._v(" s1 "),t("span",{pre:!0,attrs:{class:"token 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"),t("td",[s._v("...")])])])])])}),[],!1,null,null,null);t.default=e.exports}}]);