IS NULL : IS NULL ISNULL « Comparison Functions Operators « MySQL Tutorial

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MySQL Tutorial » Comparison Functions Operators » IS NULL ISNULL

15. 9. 1. IS NULL


mysql>

Tests whether a value is NULL.

mysql>

mysql> SELECT 1 IS NULL, 0 IS NULL, NULL IS NULL;

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

| 1 IS NULL | 0 IS NULL | NULL IS NULL |

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

|         0 |         0 |            1 |

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

1 row in set (0.00 sec)



mysql>

15. 9. IS NULL ISNULL
	15. 9. 1.	IS NULL
	15. 9. 2.	IS NOT NULL: Tests whether a value is not NULL
	15. 9. 3.	Check to see if the first name is NULL
	15. 9. 4.	ISNULL(expr): If expr is NULL, ISNULL() returns 1, otherwise it returns 0
	15. 9. 5.	SELECT ISNULL(1/0);
	15. 9. 6.	Using ISNULL in where clause
	15. 9. 7.	Using ISNULL with data in a table

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