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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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