SQL | Parameters and return values exercise | Use a default parameter value to list episodes for a given series

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 ==> Parameters and return values  (11 exercises)
Level ==> Average difficulty
Courses ==> Fast-track SQL  /  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).

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.

First (if you haven't already done so) run the script shown above to generate the Doctor Who training database.

Create a stored procedure called spListEpisodes to list out all of the episodes for a given series number.  For example to see the 14 episodes in series 2 you could run this query:

-- show all of the episodes for series 2

spListEpisodes 2

Now set a default value of Null for your parameter, such that it lists out all of the episodes if you don't specify a series number:

-- show all of the episodes

spListEpisodes

Your WHERE clause should test that either the series number equals the value of the parameter passed, or that the parameter passed is null.

Optionally, save this query as Seriously.sql, then close it down. 

This page has 0 threads Add post