ER Model and Business Rules
Use of a supertype/subtype relationship is necessary when which of the following exists?

Attributes apply to all of the instances of an entity type.
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.
An instance of a subtype participates in a relationship that is unique to that subtype.

ANSWER DOWNLOAD EXAMIANS APP

ER Model and Business Rules
A subtype discriminator is which of the following?

An attribute of the subtype whose values determine the supertype
An attribute of the supertype whose values determine the subtype
An attribute of the subtype whose values determine the subtype
An attribute of the supertype whose values determine the supertype

ANSWER DOWNLOAD EXAMIANS APP