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    Question

    Which constraint ensures that no duplicate values exist

    in a column?
    A PRIMARY KEY Correct Answer Incorrect Answer
    B UNIQUE Correct Answer Incorrect Answer
    C NOT NULL Correct Answer Incorrect Answer
    D FOREIGN KEY Correct Answer Incorrect Answer
    E CHECK Correct Answer Incorrect Answer

    Solution

    UNIQUE ensures that all values in a column are distinct, though it allows NULL values unless specified otherwise.

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