IS 'boolean_value': Tests a value against a boolean value, where boolean_value can be TRUE, FALSE, or UNKNOWN : IS « Comparison Functions Operators « MySQL Tutorial

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MySQL Tutorial » Comparison Functions Operators » IS

15. 10. 1. IS 'boolean_value': Tests a value against a boolean value, where boolean_value can be TRUE, FALSE, or UNKNOWN


mysql>

mysql> SELECT 1 IS TRUE, 0 IS FALSE, NULL IS UNKNOWN;

+-----------+------------+-----------------+

| 1 IS TRUE | 0 IS FALSE | NULL IS UNKNOWN |

+-----------+------------+-----------------+

|         1 |          1 |               1 |

+-----------+------------+-----------------+

1 row in set (0.00 sec)



mysql>

15. 10. IS
	15. 10. 1.	IS 'boolean_value': Tests a value against a boolean value, where boolean_value can be TRUE, FALSE, or UNKNOWN
	15. 10. 2.	IS NOT 'boolean_value': Tests a value against a boolean value, where boolean_value can be TRUE, FALSE, or UNKNOWN

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