Exercise: Table function to summarise a continent for month

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The answer to the exercise will be included and explained if you attend the course listed below!

Category ==> SQL  (192 exercises)
Topic ==> Table-valued functions  (6 exercises)
Level ==> Average difficulty
Course ==> Advanced 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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The aim of this exercise is to create a function that returns summary information about a given continent during a chosen month.  For example, you should be able to run this command:

SELECT * FROM dbo.fnContinentSummary('Europe','April')

Passing in Europe and April like this should give the following results:

Count aggregate within Inline function.

April unsurprisingly is an important month.

To do this, you will need to join the tblCategory, tblEvent, tblCountry and tblContinent tables together, and select COUNT(DISTINCT()) from each table.  To help you, here's what your function code should look like:

CREATE FUNCTION ChooseName

(@Para1 DataType, @Para2 DataType)

RETURNS Table

AS

RETURN

--Select statement that will form the table

Optionally save your query as Counting By Continents.sql then close it down.

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