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      Question

      A primary key in a

      table:
      A Can be null Correct Answer Incorrect Answer
      B Must be unique and not null Correct Answer Incorrect Answer
      C Can be duplicated Correct Answer Incorrect Answer
      D Can reference other tables Correct Answer Incorrect Answer
      E Is optional Correct Answer Incorrect Answer

      Solution

      Primary keys uniquely identify records in a table, and must always have unique, non-null values.

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