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Computers and Technology, 12.08.2021 17:30 miacervenka
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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