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Thread: Constraints

  1. #1
    Join Date
    Mar 2013
    Posts
    8

    Unanswered: Constraints

    Which of the following rules guarantees that every primary attribute key is non-null?
    A) Operational constraints
    B) Domain constraint
    C) Entity integrity constraint
    D) Referential integrity constraint

    What is the correct option, I am confused

    Thanks a lot in advance

  2. #2
    Join Date
    Jan 2007
    Location
    UK
    Posts
    11,434
    Provided Answers: 10
    Homework?
    Which do you think is the correct answer?
    George
    Home | Blog

  3. #3
    Join Date
    Mar 2013
    Posts
    8
    Quote Originally Posted by gvee View Post
    Homework?
    Which do you think is the correct answer?
    No its not homework, I am preparing for competitive exam and I came accross this question,
    According to me its C

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