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Software ==>	SQL (203 exercises)
Topic ==>	Variables (11 exercises)
Level ==>	Average difficulty
Subject ==>	SQL training

Use variables in SQL to capture the results of aggregation functions in queries of a Music database.

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 file called You Can Count on Me.sql from the folder shown above. Execute the script to see the count of albums and tracks in the database.

Results of counting rows in two tables in SQL Server queries.

The basic results of the two queries.

Declare two FLOAT variables called @CountAlbums and @CountTracks and use them to capture the results of the two queries.

Don't forget to wrap the queries in round brackets.

Declare another variable called @AvgTracksPerAlbum and use it to store the result of dividing the count of tracks by the count of albums.

Write a SELECT statement to display the values of the three variables, using appropriate aliases as shown below:

The values of three SQL variables displayed using a SELECT statement.

The results you should see.

Use three new variables to calculate the average number of shows per venue. Present the results as shown below:

Results of SQL queries using variables to store the results.

The results of the three new variables.

Save the script and then close it.

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.

You can find other training resources for the subject of this exercise here:

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