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  1. #1
    Join Date
    Nov 2011
    Posts
    87

    Unanswered: Reference constrain

    A question from Roger's book.

    Which type of key is defined on the child table to implement a referential constraint?
    ❍ A. Unique key
    ❍ B. Primary key
    ❍ C. Foreign key
    ❍ D. Composite key


    I thought the answer is C, but in the book explains as B.

    is it correct?

    Thanks.

  2. #2
    Join Date
    May 2003
    Location
    USA
    Posts
    5,737
    Probably an error in the book. There are also errors in the scoring of the real exams.
    M. A. Feldman
    IBM Certified DBA on DB2 for Linux, UNIX, and Windows
    IBM Certified DBA on DB2 for z/OS and OS/390

  3. #3
    Join Date
    Nov 2011
    Posts
    87
    Quote Originally Posted by Marcus_A View Post
    Probably an error in the book. There are also errors in the scoring of the real exams.

    Thanks Marcus. my colleague is going for the first db2 exam and he is not sure that if he get this type of question , need to answer incorrectly to pass the test?

    Thanks.

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