Exercise: Outputting list variables

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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 ==> Parameters and return values  (11 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 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:

Aggregate Function 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:

LEFT LEN FUNCTIONS

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

 

Optionally save this as Noisy Continents.sql, and close it down.

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