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MySQL ifnull() function

MySQL IFNULL() function

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Description

MySQL IFNULL() takes two expressions and if the first expression is not NULL, it returns the first expression. Otherwise it returns the second expression.

Depending on the context in which it is used, it returns either numeric or string value.


Syntax

IFNULL(expression1, expression2);

Arguments

Name Description
expression1 An expression.
expression2 An expression.

MySQL Version : 5.6

Example : MySQL IFNULL() function

The following MySQL statement returns the first expression, i.e. 0, since the first expression is not NULL.

SELECT IFNULL(0,2);

Output

mysql> SELECT IFNULL(0,2);
+-------------+
| IFNULL(0,2) |
+-------------+
|           0 | 
+-------------+
1 row in set (0.03 sec)

Example : IFNULL() function with non zero 1st argument

The following MySQL statement returns the first expression, i.e. 1, since the first expression is not NULL.

SELECT IFNULL(1,2);

Output

mysql> SELECT IFNULL(1,2);
+-------------+
| IFNULL(1,2) |
+-------------+
|           1 | 
+-------------+
1 row in set (0.00 sec)

Example : IFNULL() function NULL

The following MySQL statement returns the second expression, i.e. 2, since the first expression is NULL.

SELECT IFNULL(NULL,2);

Output

mysql> SELECT IFNULL(NULL,2);
+----------------+
| IFNULL(NULL,2) |
+----------------+
|              2 | 
+----------------+
1 row in set (0.00 sec)


We have compiled a number of MySQL Questions and Answers. Check and assess you MySQL skill by visiting those questions and answers.

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