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Logical Operators

About 1 min

Logical Operators

Unary Logical Operators

Supported operator !

Supported input data types: BOOLEAN

Output data type: BOOLEAN

Hint: the priority of ! is the same as -. Remember to use brackets to modify priority.

Binary Logical Operators

Supported operators AND:and,&, &&; OR:or,|,||

Supported input data types: BOOLEAN

Output data type: BOOLEAN

Note: Only when the left operand and the right operand under a certain timestamp are both BOOLEAN type, the binary logic operation will have an output value.

Example:

select a, b, a > 10, a <= b, !(a <= b), a > 10 && a > b from root.test;

运行结果

IoTDB> select a, b, a > 10, a <= b, !(a <= b), a > 10 && a > b from root.test;
+-----------------------------+-----------+-----------+----------------+--------------------------+---------------------------+------------------------------------------------+
|                         Time|root.test.a|root.test.b|root.test.a > 10|root.test.a <= root.test.b|!root.test.a <= root.test.b|(root.test.a > 10) & (root.test.a > root.test.b)|
+-----------------------------+-----------+-----------+----------------+--------------------------+---------------------------+------------------------------------------------+
|1970-01-01T08:00:00.001+08:00|         23|       10.0|            true|                     false|                       true|                                            true|
|1970-01-01T08:00:00.002+08:00|         33|       21.0|            true|                     false|                       true|                                            true|
|1970-01-01T08:00:00.004+08:00|         13|       15.0|            true|                      true|                      false|                                           false|
|1970-01-01T08:00:00.005+08:00|         26|        0.0|            true|                     false|                       true|                                            true|
|1970-01-01T08:00:00.008+08:00|          1|       22.0|           false|                      true|                      false|                                           false|
|1970-01-01T08:00:00.010+08:00|         23|       12.0|            true|                     false|                       true|                                            true|
+-----------------------------+-----------+-----------+----------------+--------------------------+---------------------------+------------------------------------------------+

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