IFNULL

Description

If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2. The default return type of IFNULL(expr1,expr2) is the more "general" of the two expressions, in the order STRING, REAL, or INTEGER.

Syntax

> IFNULL(expr1,expr2)

Examples

mysql> SELECT IFNULL(NULL,10);
+------------------+
| ifnull(null, 10) |
+------------------+
|               10 |
+------------------+
1 row in set (0.00 sec)

mysql> SELECT CAST(IFNULL(NULL, NULL) AS DECIMAL);
+-----------------------------------------+
| cast(ifnull(null, null) as decimal(10)) |
+-----------------------------------------+
|                                    NULL |
+-----------------------------------------+
1 row in set (0.01 sec)