SQL | Derived tables and CTEs exercise | Using a simple CTE to filter data

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.

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Derived tables and CTEs  (13 exercises)
Level ==> Average difficulty
Subject ==> SQL training
Before you can do this exercise, you'll need to download and unzip this file (if you have any problems doing this, click here for help). Once you've done this:
  1. Go into SQL Server Management Studio;
  2. Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
  3. 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).

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The aim of this exercise is to use a CTE to hold some data, before joining another table to your CTE. Start by selecting only events which start with a letter between A and M.

Letter ranges to be stored in CTE

This should return 300 rows - including the CategoryID column will allow us to join this CTE to the tblCategory table.

Now turn this SELECT statement into a CTE called First_Half_CTE. The layout will be something like this:

WITH First_Half_CTE

AS

(

--Select goes here

)

Now extend your query to join the tblCategory table to the CTE in the same way as you would join a normal table:

CTE join event information

This should return 300 categories (scroll down to see more cheerful events).

 

Optionally save this as Passing my CTE.sql and 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.
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