Exercise: Create multiple joins to show the shortest Doctor Who episodes

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.

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

Category ==> SQL  (115 exercises)
Topic ==> Basic joins  (6 exercises)
Level ==> Harder than average
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.

Create a query to list out the appearances of enemies in episodes which have length under 40 characters, where the length is defined as the sum of:

  • the number of characters in the author's name;
  • the number of characters in the episode's title;
  • the number of characters in the doctor's name; and
  • the number of characters in the enemy's name.

This should reveal two episodes:

Two shortest episodes

The two episodes which make it under the very low bar.

You are now a master (or mistress) of joins!  Save this as Time for a coffee, then close it down.

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