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Software ==>	SQL (203 exercises)
Topic ==>	Derived tables and CTEs (19 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

Use a Common Table Expression in a SQL query to categorise music albums according to sales certifications

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 want to download the SQL Server database that this yields:

Go into SQL Server Management Studio;
Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
Execute this script.

This will generate the database that you'll need to use in order to do this exercise (remember to refresh your list of databases to see it!). Note that any files provided are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl.

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/

The aim of this exercise is to avoid writing a query like the one shown below:

A SQL query containing a CASE expression in the SELECT list and GROUP BY clause.

We want to avoid including the highlighted case expression twice.

To avoid writing the case expression twice, you can build the query in two steps. Start by creating a query to show the sales certification and chart position for each album.