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?

mhmadesk

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2022-07-13

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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?

primary key(a1, a2, a3)
primary key(a1)
foreign key(a1, a2) references S
foreign key(a1, a2)

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mhmadesk

2022-07-13

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(d).foreign key(a1, a2)

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