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ER Model and Business Rules

Q1: A supertype/subtype hierarchy has which of the following features?

A Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype.

B Attributes are assigned at the highest logical level.

C Subtypes at the higher lever in the hierarchy inherit attributes only from their immediate subtype.

D Attributes are assigned at the lowest logical level.

ANS:B - Attributes are assigned at the highest logical level.

No answer description is available.



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