Chapter 4 Database systems

The entity relationship model (ERM) is dependent on the database type.

• True

• False

The Crow’s Foot notation is less implementation-oriented than the Chen notation.

• True

• False

An entity in the entity relationship model corresponds to a table in the relational environment.

• True

• False

In the entity relationship model, a table row corresponds to an entity instance.

• True

• False

In the Chen and Crow’s Foot notations, an entity is represented with a rectangle containing the entity’s name.

• True

• False

In the original Chen notation, each attribute is represented by an oval with the attribute name connected to an entity rectangle with a line.

• True

• False

Software vendors have adopted the Chen representation because of its compact representation.

• True

• False

A composite identifier is a primary key composed of more than one attribute.

• True

• False

The Crow’s Foot notation easily identifies multivalued attributes.

• True

• False

Composite attributes make it easier to facilitate detailed queries.

• True

• False