Logical Operators

Common logical operators include AND, OR, and NOT. The operation results are TRUE, FALSE, and NULL, where NULL indicates unknown. The operation precedence order is: NOT > AND > OR.

For detailed calculation rules, refer to Table 1, where a and b represent logical expressions.

**Table 1** Operation rules
a	b	Result of a AND b	Result of a OR b	Result of NOT a
TRUE	TRUE	TRUE	TRUE	FALSE
TRUE	FALSE	FALSE	TRUE	FALSE
TRUE	NULL	NULL	TRUE	FALSE
FALSE	FALSE	FALSE	FALSE	TRUE
FALSE	NULL	FALSE	NULL	TRUE
NULL	NULL	NULL	NULL	NULL

The operators AND and OR are commutative, meaning swapping the left and right operands does not affect the result.

Parent topic: Functions and Operators

Previous topic: Array Functions

Next topic: Comparison Operators

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