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Software ==>	SQL (203 exercises)
Topic ==>	Derived tables and CTEs (19 exercises)
Level ==>	Harder than average
Subject ==>	SQL training

Use derived table subqueries in SQL Server to merge the results of different grouping queries into a single result set.

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 Aggregating Artists.sql file from the folder shown above. You'll find a query which counts the singles released by each artist.

Results of a basic grouping query in SQL Server.

Some of the results you should see if you run the query.

Use the existing query as a derived table and join it to the Artist table so that you can display the name of the artist rather than just the ID.

Results of a grouping query used as a derived table in SQL Server.

The results are a little more readable now.

Add more derived table subqueries and join them to the Artist table to see the results shown below:

Results of multiple derived table subqueries in SQL Server.

Take care with the type of join that you use!

Save and close the file.

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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