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Q. What is a foreign key?

  • (A) A foreign key is a primary key of a relation which is an attribute in another relation
  • (B) A foreign key is a superkey of a relation which is an attribute in more than one other relations
  • (C) A foreign key is an attribute of a relation that is a primary key of another relation
  • (D) A foreign key is the primary key of a relation that does not occur anywhere else in the schema

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