SQL | Aggregation and grouping exercise | Show the number of episodes written by each author

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The answer to the exercise will be included and explained if you attend the course listed below!

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Aggregation and grouping  (8 exercises)
Level ==> Relatively easy
Course ==> Introduction to SQL
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.

The following diagram shows how the authors and episodes tables are related:

Authors and episodes

You're probably familiar with this by now!

Use this to show for each author:

  • the number of episodes they wrote;
  • their earliest episode date; and
  • their latest episode date.

If you sort these so that the most prolific authors come first, here are the first few of the 25 rows you should see:

Authors and episodes

Those who know their Doctor Who won't be surprised at the two leaders.

 

Save this query as Blink was the best, then close it down.

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