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Tip of the Day
Language: SQL
Expertise: Beginner
Mar 9, 2017

Optional Parameters in SQL

You may not know this but you can have optional Parameters in SQL. It took me forever to figure it out.

In any case, you can implement an optional parameter by declaring a parameter in your stored procedure and giving it a default value of NULL, then in your WHERE clause, you just do a check to see if the parameter (with the NULL value) is NULL. An example follows:

 CREATE PROCEDURE GetNameS
@LastName VARCHAR(50) = NULL --Creating Optional Parameter
AS
SELECT * FROM PersonalInfo
WHERE (LastName = @LastName OR @LastName IS NULL)

In the above query I tested to see if the LastName field equals the supplied value or if the supplied value (the optional parameter) IS NULL.

Hannes du Preez
 
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