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Logical operators

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마지막 업데이트 시간: 2026-05-14 21:52:52

This document introduces the basic syntax and examples of logic functions.
Logical operators
Operator
Description
Example
AND
The result is TRUE only if both the left and right operands are TRUE.
a AND b
OR
The result is TRUE if either of the left and right operands is TRUE.
a OR b
NOT
The result is FALSE only if the right operand is FALSE.
NOT a
NULL-related logical operations
The following truth tables demonstrate the processing of cases where a and b are TRUE, FALSE, and NULL:
AND and OR truth table
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
NOT truth table
a
NOT a
TRUE
FALSE
FALSE
TRUE
NULL
NULL
﻿

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Logical operators

Logical operators

NULL-related logical operations

도움말 및 지원

Operator	Description	Example
AND	The result is TRUE only if both the left and right operands are TRUE.	a AND b
OR	The result is TRUE if either of the left and right operands is TRUE.	a OR b
NOT	The result is FALSE only if the right operand is FALSE.	NOT a

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