IS NOT
Syntax
IS NOT boolean_value
Description
Tests a value against a boolean value, where boolean_value can be TRUE, FALSE, or UNKNOWN.
Examples
SELECT 1 IS NOT UNKNOWN, 0 IS NOT UNKNOWN, NULL IS NOT UNKNOWN; +------------------+------------------+---------------------+ | 1 IS NOT UNKNOWN | 0 IS NOT UNKNOWN | NULL IS NOT UNKNOWN | +------------------+------------------+---------------------+ | 1 | 1 | 0 | +------------------+------------------+---------------------+
SELECT NULL IS NOT TRUE, NULL IS NOT FALSE; +------------------+-------------------+ | NULL IS NOT TRUE | NULL IS NOT FALSE | +------------------+-------------------+ | 1 | 1 | +------------------+-------------------+
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