ER MODEL AND BUSINESS RULES QUIZ

Attributes are assigned at the highest logical level.

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

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

Attributes are assigned at the lowest logical level.

Each supertype has only one subtype.

Each subtype has only one attribute.

Each subtype has only one supertype.

Each supertype has only one attribute.

A singular noun

Specific to the organization

Concise

All of these

Disjoint with total specialization

Disjoint with partial specialization

Overlap with partial specialization

Overlap with total specialization

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

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

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

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

False

True

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

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

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

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

Relationship

Optional One

Entity

Attribute

True

False

True

False