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Logical Database Design

Logical Database Design
Weak entities do not get mapped into a relation.

True
False

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Logical Database Design
An enterprise key is a primary key whose value is unique for a given relation.

False
True

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Logical Database Design
When mapping a multivalued attribute into a relation which of the following is true?

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

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

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

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

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

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