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What is a foreign key

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What is a foreign key


  1. A foreign key is a primary key of a relation which is an attribute in another relation
  2. A foreign key is a superkey of a relation which is an attribute in more than one other relations
  3. A foreign key is an attribute of a relation that is a primary key of another relation
  4. A foreign key is the primary key of a relation that does not occur anywhere else in the schema

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 (c).A foreign key is an attribute of a relation that is a primary key of another relation

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