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    Question

    A `FOREIGN KEY` constraint is used

    to:
    A Ensure that all values in a column are unique. Correct Answer Incorrect Answer
    B Define a relationship between two tables. Correct Answer Incorrect Answer
    C Prevent NULL values in a column. Correct Answer Incorrect Answer
    D Speed up data retrieval. Correct Answer Incorrect Answer
    E Automatically generate sequential numbers. Correct Answer Incorrect Answer

    Solution

    Define a relationship between two tables.

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