Help Center/ MapReduce Service/ Component Operation Guide (LTS)/ Using HetuEngine/ Common HetuEngine SQL Syntax/ SQL Functions and Operators/ Logical Operators

Updated on 2024-10-25 GMT+08:00

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Logical Operators

Logical Operators

Operation	Description	Example
AND	If both values are true, the value is true.	a AND b
OR	If one of the two values is true, the value is true.	a OR b
NOT	If the value is false, the result is true.	NOT a

The following truth table reflects how AND and OR handle NULL values.

a	b	a AND b	a OR b
TRUE	TRUE	TRUE	TRUE
TRUE	FALSE	FALSE	TRUE
TRUE	NULL	NULL	TRUE
FALSE	TRUE	FALSE	TRUE
FALSE	FALSE	FALSE	FALSE
FALSE	NULL	FALSE	NULL
NULL	TRUE	NULL	TRUE
NULL	FALSE	FALSE	NULL
NULL	NULL	NULL	NULL

The following truth table reflects how NOT handle NULL values.

value	NOT value
TRUE	FALSE
FALSE	TRUE
NULL	NULL

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