ER MODEL AND BUSINESS RULES QUIZ

Attributes are assigned at the lowest logical level.

Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype.

Attributes are assigned at the highest logical level.

Subtypes at the higher lever in the hierarchy inherit attributes only from their immediate subtype.

Defining one or more supertypes of the subtype and forming supertype/subtype relationships.

Defining one or more subtypes of the supertype and forming supertype/subtype relationships.

Defining one or more subtypes of the supertype and not forming supertype/subtype relationships.

Defining one or more supertypes of the subtype and not forming supertype/subtype relationships.

False

True

False

True

False

True

False

True

False

True

Overlap with total specialization

Disjoint with total specialization

Overlap with partial specialization

Disjoint with partial specialization

An attribute of the subtype whose values determine the supertype

An attribute of the supertype whose values determine the supertype

An attribute of the subtype whose values determine the subtype

An attribute of the supertype whose values determine the subtype

Entity

Relationship

Optional One

Attribute