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ER Model and Business Rules

Q1: 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.

ANS:A - An instance of a subtype participates in a relationship that is unique to that subtype.

No answer description is available.



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