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

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Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Aggregation and grouping  (8 exercises)
Level ==> Average difficulty
Subject ==> SQL training
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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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23 Sep 21 at 14:40

select max(con.ContinentName) as Continent_Name

, cou.CountryName as Country_Name

, count(e.EventName) as Number_of_Events

   from [dbo].[tblEvent] e

left join [dbo].[tblCategory] c

on e.CategoryID = c.CategoryID

left join [dbo].[tblCountry] cou

on e.CountryID = cou.CountryID

left join [dbo].[tblContinent] con

on cou.ContinentID = con.ContinentID


where ContinentName not in('Europe') 

group by cou.CountryName

having  count(e.EventName)  >= 5

order by cou.CountryName