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Example

Return the specified value IF the expression is NULL, otherwise return the expression:

SELECT IFNULL(NULL, "W3Schools.com");

Definition and Usage

The IFNULL() function returns a specified value if the expression is NULL.

If the expression is NOT NULL, this function returns the expression.

Syntax

IFNULL(expression, alt_value)

Parameter Values

Parameter Description
expression Required. The expression to test whether is NULL
alt_value Required. The value to return if expression is NULL

Technical Details

Works in: From MySQL 4.0

More Examples

Example

Return the specified value IF the expression is NULL, otherwise return the expression:

SELECT IFNULL("Hello", "W3Schools.com");

Example

Return the specified value IF the expression is NULL, otherwise return the expression:

SELECT IFNULL(NULL, 500);

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