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    Question

    Which of the following is true about the primary key in

    a relational database?
    A Can contain NULL values Correct Answer Incorrect Answer
    B Uniquely identifies each row in a table Correct Answer Incorrect Answer
    C Can be duplicated in the same table Correct Answer Incorrect Answer
    D Can reference multiple tables Correct Answer Incorrect Answer
    E Only used for sorting Correct Answer Incorrect Answer

    Solution

    A primary key ensures uniqueness and cannot contain NULL values.

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