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    Question

    Which SQL constraint ensures that a column cannot have

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

    Solution

    NOT NULL ensures that a column must always have a value; it cannot be left empty.

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