Exercise: List courses for given resource - output param

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 Wise Owl course listed below!

Category ==> SQL  (115 exercises)
Topic ==> Parameters and return values  (8 exercises)
Level ==> Harder than average
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).

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If you haven't already done so, run the stored procedure in the above folder to generate a database of training courses and delegates. This database contains a table of resources called tblResource:

SQL exercise - Parameters and return values (image 1)

There are only 5 resources - each has a name and id

The database also contains a list of scheduled courses called tblSchedule, showing for each course which resources it uses:

SQL exercise - Parameters and return values (image 2)

The first course, for example, uses resources 574 and 595 - ie SPECIAL EQUIPMENT and a FLIP CHART

Write a stored procedure which:

  • Takes in the name of a resource as a parameter
  • Works out the id of this resource (or returns prematurely if the resource name doesn't exist in the tblResource table)
  • Works out how many courses use this resource (see hint below), and returns this number

You can use either an output parameter or a return value to return the number (the example below uses both, which is definitely overkill):

SQL exercise - Parameters and return values (image 3)

This is what calling your stored procedure could look like

To work out which courses use a resource, add a comma before and after both the ResourceIds column value and the resource id that you're looking for - then it won't matter whether the resource that you're searching for is the first, last or only one in its list.

Optionally, save the query to generate this stored procedure as Resource course count.sql, then close it down.

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