Exercise: Use parameters in procedures to show a doctor's companions

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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 ==> Average difficulty
Course ==> Advanced SQL
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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

spCompanionsForDoctor 'Ecc'


-- show the 5 companions for Matt Smith

spCompanionsForDoctor 'matt'


-- show the 17 companions for any doctor



Optionally, save this query as Daily apples, then close it down.

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