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Software ==>	SQL (203 exercises)
Topic ==>	Parameters and return values (17 exercises)
Level ==>	Harder than average
Subject ==>	SQL training

Return from a stored proecure the name of the country with the most events and how many events there were.

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.

Before you can do this exercise, you'll need to download and unzip this file . Once you've done this:

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).

First write a stored procedure to show which country has the most events:

Output parameters Countries Events

Your query should show these results - we now want to capture these two bits of information, and return them to the calling query.

Add two output parameters to your procedure:

Parameter	What it should take
@TopCountry	The country name
@EventCount	The number of events for it

The parameters must have a default value, and must include the word OUTPUT.

Amend your procedure to capture the country name and number of events in these variables, within your SELECT clause:

SELECT TOP 1

--Values go into parameters just like variables

@TopCountry = CountryName

,@EventCount= COUNT(E.CountryID)

FROM ...

Open a new window to execute the procedure. Create two variables to store the values held in the output parameters.

Using output parameters will give you headaches.

The tricky part is setting the parameters equal to the variables: remember to specify OUTPUT!

Select the two variables to check the information has been successfully output.

Optionally save this as Most Eventful Country.sql, 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.

You can find other training resources for the subject of this exercise here:

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