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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.
True
False
Correct Answer:
True
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Logical Database Design
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.
A composite attribute does not get mapped into a relation.
A synonym is two or more attributes that have different names but the same meaning.
If a relation is in third normal form, it does not need to be in second normal form.
Well-structured relations encourage anomalies of data.
A foreign key may be null and still adhere to the referential integrity constraint.
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