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|
+-----------------------------+-----------+-----------+----------------+--------------------------+---------------------------+------------------------------------------------+