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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.
Correct Answer:
Two relations are created.
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Logical Database Design
Weak entities do not get mapped into a relation.
In a 1:M relationship, the primary key on the one side migrates to the many side to become the foreign key on the many side.
A primary key may be null.
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.
An enterprise key is a primary key whose value is unique for a given relation.
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A relation is a two-dimensional table.
A null value is assigned when no other value applies.
A candidate key must uniquely identify each row.
A composite attribute does not get mapped into a relation.
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