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ISNULL Function

Posted By: Sarita Patel     Category: SQL Server     Views: 5061

This article explains about ISNULL function in sql server with examples.

ISNULL function is used to replace null with specified value.  


Syntax of ISNULL Function :

ISNULL (check_expression ,replacement_value)

check_expression is any valid sql server expression to be checked for NULL value. It can be of any type.

replacement_value is any valid sql server expression to be returned when checked_expression is null. 

Data type of checked_expression and replacement_value must be same.

Return type of ISNULL function is same as check_expression.




Examples of ISNULL Function :

Example 1 : Use of ISNULL function in select clause 

SELECT ContactName, ISNULL(Fax,'Not Available') AS Fax
FROM    Customers

Output
ContactName                 Fax
Elizabeth Lincoln            (604) 555-3745
Victoria Ashworth          Not Available
Patricio Simpson            (1) 135-4892
Francisco Chang            (5) 555-7293
Yang Wang                   Not Available
Pedro Afonso                Not Available
Elizabeth Brown            (171) 555-9199

Above example returns customers name and fax number by substituting null where fax number is not available.
  
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Sarita Patel
Sarita Patel author of ISNULL Function is from United States.
 
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