SELECT ISNULL(1/0); : IS NULL ISNULL « Comparison Functions Operators « MySQL Tutorial

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MySQL Tutorial » Comparison Functions Operators » IS NULL ISNULL

15. 9. 5. SELECT ISNULL(1/0);


mysql>

mysql> SELECT ISNULL(1/0);

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

| ISNULL(1/0) |

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

|           1 |

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

1 row in set (0.00 sec)



mysql>

mysql>

ISNULL() can be used instead of = to test whether a value is NULL.

Comparing a value to NULL using = always yields false.

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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