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

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

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Logical Database Design
When mapping a supertype/subtype relationship which of the following is true?

The supertype primary key is assigned to each subtype.
There is no primary key/foreign key relationship between a supertype/subtype.
The subtype primary key is assigned to each supertype.
There is no link between the supertype/subtype entities.

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