NULLIF(expr1,expr2) : NULLIF « Control Flow Functions « MySQL Tutorial

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MySQL Tutorial » Control Flow Functions » NULLIF

18. 5. 1. NULLIF(expr1,expr2)

Returns NULL if expr1 = expr2 is true, otherwise returns expr1.


mysql>

mysql> SELECT NULLIF(1,1);

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

| NULLIF(1,1) |

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

|        NULL |

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

1 row in set (0.00 sec)



mysql> SELECT NULLIF(NULL,2);

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

| NULLIF(NULL,2) |

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

| NULL           |

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

1 row in set (0.00 sec)

18. 5. NULLIF
	18. 5. 1.	NULLIF(expr1,expr2)
	18. 5. 2.	Using NULLIF with data in a table

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