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      Question

      In a relational database, what is a foreign key?

      A A key that uniquely identifies a row in its own table Correct Answer Incorrect Answer
      B A key that references a primary key in another table Correct Answer Incorrect Answer
      C A key used for sorting Correct Answer Incorrect Answer
      D A key used for indexing only Correct Answer Incorrect Answer
      E A key storing encrypted values Correct Answer Incorrect Answer

      Solution

      Foreign keys maintain relationships between tables and enforce referential integrity.

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