Boolean Testing Operators
Description
This operator is used exclusively to check for TRUE, FALSE, or NULL. For an introduction to NULL, please refer to the "Nulls" section.
Operator Introduction
| Operator | Function | Example |
|---|---|---|
x IS [NOT] TRUE | Checks if x is TRUE. Returns TRUE if x is TRUE, otherwise returns FALSE. | SELECT 1 IS NOT TRUE |
x IS [NOT] FALSE | Checks if x is FALSE. Returns TRUE if x is FALSE, otherwise returns FALSE. | SELECT 1 IS NOT FALSE |
x IS [NOT] NULL | Checks if x is NULL. Returns TRUE if x is NULL, otherwise returns FALSE. | SELECT 1 IS NOT NULL |
