ER MODEL AND BUSINESS RULES QUIZ

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

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

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

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

False

True

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 supertypes of the subtype and not forming supertype/subtype relationships.

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

A singular noun

All of these

Concise

Specific to the organization

Disjoint with total specialization

Overlap with total specialization

Overlap with partial specialization

Disjoint with partial specialization

False

True

True

False

True

False

Relationship

Entity

Optional One

Attribute

Each supertype has only one subtype.

Each subtype has only one supertype.

Each supertype has only one attribute.

Each subtype has only one attribute.