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    Question

    Which of the following is true about a foreign

    key?
    A Must be unique in its table Correct Answer Incorrect Answer
    B References a primary key in another table Correct Answer Incorrect Answer
    C Cannot be null Correct Answer Incorrect Answer
    D Automatically indexed Correct Answer Incorrect Answer
    E Can only exist in the parent table Correct Answer Incorrect Answer

    Solution

    A foreign key establishes a relationship between two tables by referencing the primary key of another table.

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