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SQL | Parameters and return values exercise | Use parameters in procedures to show a doctor's companions
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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 procedure called spCompanionsForDoctor which will list out all of the companions for a given doctor (or all of the companions in the database if you leave the doctor's name parameter out). You'll need to link the following tables:
- tblCompanion to tblEpisodeCompanion, using the CompanionId column; tblEpisodeCompanion to tblEpisode, using the EpisodeId column; and
- tblEpisode to tblDoctor, using the DoctorId column.
To test your procedure out, see if you get 3, 5 and 17 companions' names respectively when you run these tests:
-- show the 3 companions for Christopher Eccleston
-- show the 5 companions for Matt Smith
-- show the 17 companions for any doctor
Optionally, save this query as Daily apples, then close it down.