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