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Software ==> | SQL (203 exercises) |
Topic ==> | Derived tables and CTEs (19 exercises) |
Level ==> | Average difficulty |
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 the exercise is to avoid writing a query which groups by multiple columns, like the one shown below:
It seems silly to have to group by three columns just to display their values.
Start by creating a query which groups rows in the Track table by the Album_ID, creating the aggregated values shown below:
We have the aggregates we want, now we need to add some descriptive labels.
Convert this query into a common table expression and join it to the Album table to show the following results:
The final results of the query.
Save the script as Joining CTEs.sql and then close it.
You can find other training resources for the subject of this exercise here:
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