SQL Server ISNULL() Function

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SQL Server

ISNULL()

Function

Example

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

SELECT ISNULL(NULL, ‘W3Schools.com’);


Definition and Usage

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

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

Syntax

ISNULL(

expression

,

value

)

Parameter Values

Parameter Description

expression
Required. The expression to test whether is NULL

value
Required. The value to return if

expression

is NULL

Technical Details

Works in: SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data
Warehouse, Parallel Data Warehouse

More Examples

Example

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

SELECT ISNULL(‘Hello’, ‘W3Schools.com’);

Example

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

SELECT ISNULL(NULL, 500);