While ______ and ________ constraints are specified on individual relation, the _______ constraint is specified between two or more relations.
A
Key, Entity, Referential Integrity
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B
Entity, Candidate, Referential Integrity
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C
Key, Attribute, Referential Integrity
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D
Candidate, Referential Integrity, Attribute
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Solution
The correct option is A Key, Entity, Referential Integrity While key and entity constraints are specified on individual relation, the referential integrity constraint is specified between two or more relations. This constraint is specified to maintain consistency among the tuples in such relations.