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    Question

    In a relational database, what is a candidate

    key?
    A Any attribute that can be NULL Correct Answer Incorrect Answer
    B A key that uniquely identifies a row and can be chosen as a primary key Correct Answer Incorrect Answer
    C A key used for sorting Correct Answer Incorrect Answer
    D A foreign key reference Correct Answer Incorrect Answer
    E None of the above Correct Answer Incorrect Answer

    Solution

    Candidate keys are potential primary keys; one is selected as the primary key.

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