Use of a supertype/subtype relationship is necessary when which of the following exists?

A An instance of a subtype participates in a relationship that is unique to that subtype
B An instance of a subtype participates in a relationship that is the same as the other subtypes
C Attributes apply to all of the instances of an entity type
D No attributes apply to any of the instances of an entity type

Correct Answer: An instance of a subtype participates in a relationship that is unique to that subtype

Super-types and sub-types show hierarchy in the structure; graphs and trees show hierarchy in the data.
Bissoy MCQ
#Oracle Database #The Atomic Data Models and Business Models

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