A

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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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