Referential integrity constraints are also called as _________
(a) Functional dependencies
(b) Subset dependencies
(c) Superset dependencies
(d) Primary dependencies
(a) Functional dependencies
(b) Subset dependencies
(c) Superset dependencies
(d) Primary dependencies
Correct choice is (b) Subset dependencies
The best explanation: Referential integrity constraints are also called as subset dependencies. It is called so because the set of foreign key values in r1 of r2 must be a subset of the set of primary key values in r2.