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SQL | Archived exercise | List courses for given resource - output param
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You can learn how to do this exercise on the relevant Wise Owl classroom training course (sadly for the moment only in the UK).
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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:
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:
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):
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.