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Software ==> | SQL (203 exercises) |
Topic ==> | Derived tables and CTEs (19 exercises) |
Level ==> | Relatively easy |
Subject ==> | SQL training |
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.
This will generate the database that you'll need to use in order to do this exercise (remember to refresh your list of databases to see it!). Note that any files provided 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.
If you don't have a copy of the Music_01 database, follow the instructions at the following link to create it: www.wiseowl.co.uk/sql/exercises/standard/using-sql-server/5257/
The aim of this exercise is to avoid writing a query like the one shown below:
We want to avoid including the highlighted case expression twice.
To avoid writing the case expression twice, you can build the query in two steps. Start by creating a query to show the sales certification and chart position for each album.
This first query produces the base data for the next step. You'll need to include the case expression to get these results.
Use the with keyword to convert this query into a common table expression, then use it to produce the following results:
We've sorted the results in ascending order of the average chart position.
Save the script as CTEasy.sql and then close it.
You can find other training resources for the subject of this exercise here:
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