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Asked: 2026-06-17T05:10:27+00:00

I have a data model which is as follows … A Topic can have

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I have a data model which is as follows …

  • A Topic can have multiple Exercises (ExerciseTopic(FK) references TopicId(PK))
  • An Exercise can have multiple Questions (Exercise(FK) references ExerciseId(PK))
  • A Question can have multiple (4) AnswerChoices

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I would like to have a three part primary key for AnswerChoices table as it is this combination that will uniquely identify each choice.

  • Will I need a foreign key in AnswerChoices table for data integrity purposes or
  • Will the composite primary key be sufficient? If the foreign key is required, will it be two part composite foreign key (ExerciseId, QuestionId)?

Sample data …

  • Topic (T1)
    • Exercise E1
      • Question 1 (AnswerChoices: a, b, c, d)
      • Question 2 (AnswerChoices: a, b, c, d)
      • Question 3 (AnswerChoices: a, b, c, d)
    • Exercise E2
      • Question 1 (AnswerChoices: a, b, c, d)
      • Question 2 (AnswerChoices: a, b, c, d)
      • Question 3 (AnswerChoices: a, b, c, d)
    • Exercise E3
      • Question 1 (AnswerChoices: a, b, c, d)
      • Question 2 (AnswerChoices: a, b, c, d)
      • Question 3 (AnswerChoices: a, b, c, d)
  • Topic (T2)
    • Exercise E1
      • Question 1 (AnswerChoices: a, b, c, d)
      • Question 2 (AnswerChoices: a, b, c, d)
      • Question 3 (AnswerChoices: a, b, c, d)
    • Exercise E2
      • Question 1 (AnswerChoices: a, b, c, d)
      • Question 2 (AnswerChoices: a, b, c, d)
      • Question 3 (AnswerChoices: a, b, c, d)
    • Exercise E3
      • Question 1 (AnswerChoices: a, b, c, d)
      • Question 2 (AnswerChoices: a, b, c, d)
      • Question 3 (AnswerChoices: a, b, c, d)
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1 Answer

  1. Editorial Team

    It looks like you’ll need a four-column key in AnswerChoices: {TopicID, ExerciseID, QuestionID, ChoiceID}. And the table “AnswerChoices” should have a foreign key (TopicID, ExerciseID, QuestionID) references Questions (TopicID, ExerciseID, QuestionID).

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