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Software ==>	SQL (129 exercises)
Topic ==>	Parameters and return values (11 exercises)
Level ==>	Average difficulty
Subject ==>	SQL training

Use an output parameter to return a list variable of the most eventful continents

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).

The aim of this exercise is to create a stored procedure which will output a variable containing a comma-delimited list of the continents which have 50 or more events. Start by selecting these continents in a stored procedure:

Remember when using aggregates for filtering you will need to use the HAVING clause.

Now turn this into a list variable separated using commas, but don't worry about removing the trailing comma. Store this list variable in an output parameter:

SELECT

@OutputParameter = @Outputparameter +

ContinentName + ', '

Execute the stored procedure on a new page and capture the output in a variable, then remove the trailing comma:

Use the LEN and LEFT functions to remove the trailing comma.

Optionally save this as Noisy Continents.sql, and 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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EXERCISE TOPIC

SQL EXERCISES

SQL EXERCISES

Use an output parameter to return a list variable of the most eventful continents

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