ER MODEL AND BUSINESS RULES QUIZ

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.

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.

True

False

Circle

Diamond

Oval

Rectangle

Entity

Optional One

Relationship

Attribute

False

True

Authorization

Integrity Control

Condition

Enabler

Each subtype has only one supertype.

Each subtype has only one attribute.

Each supertype has only one subtype.

Each supertype has only one attribute.

False

True

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.

Attributes are assigned at the lowest logical level.

False

True