ER MODEL AND BUSINESS RULES QUIZ

Overlap with total specialization

Disjoint with total specialization

Disjoint with partial specialization

Overlap with partial specialization

An instance of a subtype participates in a relationship that is the same as the other subtypes.

An instance of a subtype participates in a relationship that is unique to that subtype.

Attributes apply to all of the instances of an entity type.

No attributes apply to any of the instances of an entity type.

Optional One

Relationship

Attribute

Entity

Attributes are assigned at the lowest logical level.

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

Attributes are assigned at the highest logical level.

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

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

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.

Overlap with partial specialization

Disjoint with total specialization

Overlap with total specialization

Disjoint with partial specialization

False

True

False

True

False

True

True

False