Logical Database Design
The entity integrity rule states that:

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

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Logical Database Design
A transitive dependency is which of the following?

A functional dependency between two or more nonkey attributes.
A functional dependency between two or more key attributes.
A relation that is in second normal form.
A relation that is in first normal form.

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