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

Show enemies appearing in chosen episodes, using a Common Table Expression (CTE)

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 .

First (if you haven't already done so) run the script shown above to generate the Doctor Who training database.

The aim of this exercise is to show a list of all of the enemies appearing in Doctor Who episodes featuring Rose Tyler, but not David Tennant.

It's possible - probable, even - that you could do this with a single SELECT statement, but CTEs make it so much easier to divide a complicated query into two simpler parts!

First create a query to show the episode id numbers for the 13 episodes which feature Rose Tyler as a companion, but not David Tennant as the Doctor.

Linking to this as a CTE, show the 8 enemies which appear in these episodes (some more than once):

List of enemies

The enemies corresponding to episodes featuring Rose Tyler, but not David Tennant.

Optionally, save this query as Wonderful CTEs.sql, then close it down.

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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