SQL | Aggregation and grouping exercise | Show continents/countries having lots of events

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You can learn how to do this exercise if you attend the course listed below!

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Aggregation and grouping  (8 exercises)
Level ==> Average difficulty
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). Once you've done this:
  1. Go into SQL Server Management Studio;
  2. Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
  3. Execute this script.

This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).

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Create a query listing out for each continent and country the number of events taking place therein:

List of events

The first few of the 42 rows you should get from this query, if you sort the results by country name.


You'll need to join the tblContinent, tblCountry and tblEvent tables.  All good practice!

Now change your query so that it omits events taking place in the continent of Europe:

Events excluding Europe

You should now be down to 25 rows.


Finally, change your query so that it only shows countries having 5 or more events:

Countries with lots of events

You should now be down to 3 rows.


A thought: you should just have used every one of the SFWGHO letters!

Save your query as Post Brexit events, then close it down.

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.
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