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Software ==>	SQL (129 exercises)
Topic ==>	Derived tables and CTEs (13 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:

Here's what NOT to do - we want to avoid repeating the same calculation twice.

To do this, you can do the calculation in two bites, using a CTE to hold the intermediate stage. First create a query to show the era for each event:

You could peek at the expression at the start of this exercise to get help on how to calculate the era!

Now store this as a CTE, and write a query using it which shows the number of events per era:

What the entire query should show when you run it.

Save this query as Epoch-making, 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.

You can find other training resources for the subject of this exercise here:

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EXERCISE TOPIC

SQL EXERCISES

SQL EXERCISES

Create an expression in a common table expression, and group by this in a query using the CTE

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