Mysql ISNULL function

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Belongs to : Mysql

ISNULL():

Syntax:ISNULL(expression);

If expr is NULL, ISNULL() returns 1, otherwise it returns 0.

mysql> SELECT ISNULL(1+1);
-> 0
mysql> SELECT ISNULL(1/0);
-> 1

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

SELECT ISNULL(field,0) FROM TABLE

If the field is not null, returns its value; otherwise, 0.

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By - Rekha, On - 2010-01-28

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