SQL | Parameters and return values exercise | Outputting list variables

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 the course listed below!

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
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).

You need a minimum screen resolution of about 700 pixels width to see our exercises. This is because they contain diagrams and tables which would not be viewable easily on a mobile phone or small laptop. Please use a larger tablet, notebook or desktop computer, or change your screen resolution settings.

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.

This page has 0 threads Add post