Referential integrity specifies that the value of an attribute of one relation depends on the existence of the same attribute in another relation.

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Referential integrity is a constraint that ensures that the value of a foreign key attribute in one relation must match the value of a primary key attribute in another relation or be null. Therefore, the value of an attribute in one relation depends on the existence of the same attribute in another relation.

Referential Integrity Specifies That the Value of an Attribute of One