SQL | Aggregation and grouping exercise | Create a query using every SQL key word

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.

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Aggregation and grouping  (8 exercises)
Level ==> Harder than average
Subject ==> SQL training
Before you can do this exercise, you'll need to download and unzip this file (if you have any problems doing this, click here for help).

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If you haven't already done so, run the script in the above folder to generate the Doctor Who database.

Write a query to list out for each episode year and enemy the number of episodes made, but in addition:

  • Only show episodes made by doctors born before 1970; and
  • Omit rows where an enemy appeared in only one episode in a particular year.

Your answer should look like this:

Final four rows

The first 3 are probably for  Christopher Eccleston, and the last one for Peter Capaldi.


Save this query as SFWGHO (you should know why!), 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.
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