WISE OWL EXERCISES
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- Table-valued functions (6)
- Derived tables and CTEs (13)
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SQL | Table-valued functions exercise | Use a table-valued function to show episodes for a given doctor
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First (if you haven't already done so) run the script shown above to generate the Doctor Who training database.
Create a table-valued function to list out all of the episode details for a given doctor. Here's the syntax, as a reminder:
CREATE FUNCTION FunctionName(
-- return data from a single SELECT statement
You should be able to run this query to show the episodes in which anyone called Chris appeared:
-- show the Christopher Eccleston episodes
SELECT * FROM dbo.fnEpisodesByDoctor('Chris')
Here's what this should show:
The first few of the 13 episodes in which Christopher Eccleston appeared.
Create a query based on this (you'll need to give the results returned by the function a table alias, and create a join from this to the tblAuthor table) to show the details (including author) for episodes made by doctors called Chris:
The 13 episodes made by Christopher Eccleston, bringing in the author name from the tblAuthor table.
Optionally, save this query as Episodes by doctor.sql, then close it down.