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    Question

    A primary key in a

    table:
    A Can be null Correct Answer Incorrect Answer
    B Must be unique and not null Correct Answer Incorrect Answer
    C Can be duplicated Correct Answer Incorrect Answer
    D Can reference other tables Correct Answer Incorrect Answer
    E Is optional Correct Answer Incorrect Answer

    Solution

    Primary keys uniquely identify records in a table, and must always have unique, non-null values.

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