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SQL | Derived tables and CTEs exercise | Create a series of CTES to answer a fairly contrived question
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.
You can learn how to do this exercise if you attend one of more of the courses listed below!
- 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).
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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|
If you display the results in date order, you should get this:
The first few of the 116 events returned by your final query.
In the event that you get this working, save your query as Owl-free events, then close it down.