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If an entity set is a lower-level entity set in more than one ISA relationship, then the entity set has

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If an entity set is a lower-level entity set in more than one ISA relationship, then the entity set has (a) Hierarchy (b) Multilevel inheritance (c) Single inheritance (d) Multiple inheritance The question was asked in unit test. Question is taken from Extended E-R Features in section Database Systems Design and Implementation of Database Management

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Correct answer is (d) Multiple inheritance For explanation: The attributes of the higher-level entity sets are said to be inherited by the lower-level entity sets.

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