SQL | Aggregation and grouping exercise | Show the number of events for each category

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Software ==> SQL  (192 exercises)
Version ==> Any version of SQL Server
Topic ==> Aggregation and grouping  (8 exercises)
Level ==> Relatively easy
Course ==> Introduction to SQL
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  2. Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
  3. Execute this script.

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Create a query which:

  • groups by the category name from the category table; and
  • counts the number of events for each.

You'll need to create a join between the tblCategory and tblEvent tables to do this.

Here's what you should see if you sort your query to show the categories with most events first:

First few events

The first few categories returned by your query. Politics trumps everything.

 

Save this query as Politics and disaster, then close it down.

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