📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!


    Question

    Which constraint ensures that a column contains only

    unique values, but allows 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

    UNIQUE

    Practice Next
    ask-question