A candidate key must uniquely identify each row.

A null value is assigned when no other value applies.

Well-structured relations encourage anomalies of data.

A synonym is two or more attributes that have different names but the same meaning.

A foreign key may be null and still adhere to the referential integrity constraint.

If a relation is in third normal form, it does not need to be in second normal form.

The primary key in a relation does not need to be underlined.

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.

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.

Normalization is a formal process for deciding which attributes should be grouped together in a relation.

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

A composite attribute does not get mapped into a relation.

A relation is a two-dimensional table.

Weak entities do not get mapped into a relation.

A primary key may be null.