Exercise: Show events by decade

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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
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 got it set up in SQL server, restore the Historical Events database from the above folder.

Create a query to show the number of events for each decade:

SQL exercise - Aggregation and grouping (image 1)

The decade names have been chosen to ensure that they appear in the correct order in our query

You'll need a  fairly long CASE statement to do this, and a fair bit of patience.

Save this query as Events by decade, then close it down.

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