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Logical Database Design

Logical Database Design
If a relation is in third normal form, it does not need to be in second normal form.

False
True

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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
The entity integrity rule states that:

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

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

False
True

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

A derived attribute
An attribute that uniquely identifies each column
Any attribute
An attribute that uniquely identifies each row

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

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

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