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1. An enterprise key is a primary key whose value is unique for a given relation.

A. True
B. False

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2. A composite attribute does not get mapped into a relation.

A. True
B. False

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3. A relation is a two-dimensional table.

A. True
B. False

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4. Weak entities do not get mapped into a relation.

A. True
B. False

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5. A primary key may be null.

A. True
B. False

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