Exercise: Create a query using every SQL key word

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

Category ==> SQL  (115 exercises)
Topic ==> Aggregation and grouping  (6 exercises)
Level ==> Harder than average
Course ==> Introduction to SQL
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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.

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