If a1, a2, a3 are attributes in a relation and S is another relation, which of the following is an incorrect specification of an integrity constraint?

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Mr. Dubey

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Q. If a1, a2, a3 are attributes in a relation and S is another relation, which of the following is an incorrect specification of an integrity constraint?

(A) primary key(a1, a2, a3)
(B) primary key(a1)
(C) foreign key(a1, a2) references S
(D) foreign key(a1, a2)

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✅ Correct Answer: (D) foreign key(a1, a2)

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