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SQL | Parameters and return values exercise | Use parameters in procedures to show a doctor's companions
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.
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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.