A composite attribute does not get mapped into a relation.

More Questions from Logical Database Design

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

Discussion & Comments