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

Use a series of CTEs to show categories for countries for events not containing the letters OWL

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 . Once you've done this:

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 (note that the database and script 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).

The aim of this exercise is to use CTEs to answer the following questions:

Step	What to do	Returns
1	Get a list of those events which contain none of the letters in the word OWL	3 rows
2	Use this to get a list of all of those events which take place in the countries for the events in list 1.	9 rows
3	Get a third list of all of the events which share the same categories as any of the events in the second list.	116 rows