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Logical Database Design

Logical Database Design
A null value is assigned when no other value applies.

False
True

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Logical Database Design
The primary key in a relation does not need to be underlined.

True
False

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

True
False

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Logical Database Design
When mapping a many-to-many unary relationship into a relation which of the following is true?

Two relations are created.
Three relations are created.
One relation is created.
Four relations are created.

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Logical Database Design
A composite attribute does not get mapped into a relation.

False
True

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Logical Database Design
Well-structured relations encourage anomalies of data.

True
False

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