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Exercises

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

Create an expression in a common table expression, and group by this in a query using the 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 . 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 count the number of events by a column called Era which you'll calculate, without including this calculation twice: