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Which statement is true about an index that is used to support a UNIQUE constraint?

Which statement is true about an index that is used to support a UNIQUE constraint?

PrepAway - Latest Free Exam Questions & Answers

A.
It must not contain more than one column.

B.
It cannot be used in a referential constraint.

C.
It must be defined with the UNIQUE attribute.

D.
It must be defined as UNIQUE WHERE NOT NULL.

Explanation:


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