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Software ==>	SQL (203 exercises)
Topic ==>	Testing conditions (3 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

Use IF statements in a SQL stored procedure to return the results of different SELECT statements.

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

Before you can do this exercise, you'll need to download and unzip this file .

If you don't have a copy of the Music_01 database, follow the instructions at the following link to create it: www.wiseowl.co.uk/sql/exercises/standard/using-sql-server/5257/

Open the Albums or Singles.sql file in the folder shown above. Execute the script to create a stored procedure which can return a list of albums or singles (or both) released in a given year.

A SQL statement to create a stored procedure with two optional parameters.

Both parameters are optional.

Currently, the procedure will return the results of all three queries regardless of what you pass into the @AlbumOrSingle parameter.

Add an IF statement so that if the word Album is given to the @AlbumOrSingle parameter, the procedure selects the list of matching albums and then uses a RETURN statement to exit.

If you want to perform multiple actions based on the result of a condition, don't forget to use a BEGIN END block.

Add another IF statement to return a list of singles and exit the procedure if the word Single is given to the @AlbumOrSingle parameter.

Add a third IF statement which returns the combined list of albums and singles and exits the procedure if the @AlbumOrSingle parameter is omitted.

Add a final statement to the procedure which shows a message if a word other than Album or Single is passed to the @AlbumOrSingle parameter.