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Logical Database Design

Logical Database Design
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.

False
True

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Logical Database Design
A foreign key may be null and still adhere to the referential integrity constraint.

False
True

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Logical Database Design
A candidate key must uniquely identify each row.

True
False

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Logical Database Design
The entity integrity rule states that:

no primary key can be composite.
no primary key may be equal to a value in a foreign key.
no primary key may be unique.
no primary key attribute may be null.

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Logical Database Design
Normalization is a formal process for deciding which attributes should be grouped together in a relation.

True
False

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Logical Database Design
A foreign key is which of the following?

Any attribute
An attribute that serves no purpose
The same thing as a primary key
An attribute that serves as the primary key of another relation

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