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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.
The subtype primary key is assigned to each supertype.
There is no link between the supertype/subtype entities.
There is no primary key/foreign key relationship between a supertype/subtype.
Correct Answer:
The supertype primary key is assigned to each subtype.
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Logical Database Design
When mapping a multivalued attribute into a relation which of the following is true?
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.
Normalization is a formal process for deciding which attributes should be grouped together in a relation.
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.
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