When mapping a many-to-many unary relationship into a relation which of the following is true?
Answer: B
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The primary key in a relation does not need to be underlined.
Answer: B
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A foreign key may be null and still adhere to the referential integrity constraint.
Answer: A
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If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form?
Answer: B
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When mapping a supertype/subtype relationship which of the following is true?
Answer: A
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The primary key of the new relation in a many-to-many relationship is a composite key comprised of the primary keys of each of the binary entities.
Answer: A
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Weak entities do not get mapped into a relation.
Answer: B
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The relational model consists of:
Answer: A
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A foreign key is which of the following?
Answer: C
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If no multivalued attributes exist in a relation, then the relation is in what normal form?
Answer: A
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