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    Question

    Which database constraint ensures that duplicate values

    cannot exist in a particular column?
    A Primary Key Correct Answer Incorrect Answer
    B Unique Key Correct Answer Incorrect Answer
    C Default Key Correct Answer Incorrect Answer
    D Foreign Key Correct Answer Incorrect Answer
    E Check Key Correct Answer Incorrect Answer

    Solution

    A Unique Key constraint ensures that all values in a column are distinct , preventing duplicate entries.

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