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SQL | Table-valued functions exercise | Table function to summarise a continent for month
This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.
The answer to the exercise will be included and explained if you attend one of more of the courses listed below!
| Software ==> | SQL (198 exercises) |
| Version ==> | Any version of SQL Server |
| Topic ==> | Table-valued functions (6 exercises) |
| Level ==> | Average difficulty |
| Courses ==> | Fast-track SQL / Advanced SQL |
- Go into SQL Server Management Studio;
- Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
- 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:
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.