Learn more about the logical functions AND, OR, NOT, logical values TRUE, FALSE, and the special meta-value UNKNOWN.
Overview
| Function / value | Description |
|---|
AND | Returns TRUE if all its arguments evaluate to TRUE; it returns FALSE if one or more arguments evaluate to FALSE. |
NOT | Reverses the value of its boolean argument. |
OR | Returns TRUE if at least one of its arguments evaluates to TRUE; it returns FALSE if none of the arguments evaluate to TRUE. |
UNKNOWN | Use the '?' (question mark), representing UNKNOWN |
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| , to check if an expression or an attribute has a value. |
TRUE | This is the boolean value TRUE. |
FALSE | This is the boolean value FALSE. |
Functions
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