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MySQL:
IS
Syntax:
IS boolean_value
Tests a value against a boolean value, where boolean_value can be TRUE,
FALSE, or UNKNOWN.
Example
mysql> SELECT 1 IS TRUE, 0 IS FALSE, NULL IS UNKNOWN;
-> 1, 1, 1
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Syntax:
IS boolean_value
Tests a value against a boolean value, where boolean_value can be TRUE,
FALSE, or UNKNOWN.
mysql> SELECT 1 IS TRUE, 0 IS FALSE, NULL IS UNKNOWN;
-> 1, 1, 1