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Which of the following is the specialization that permits multiple sets(a) Superclass specialization(b) Disjoint specialization(c) Overlapping specialization(d) None of the mentionedThe question was posed to me in examination.The above asked question is from Extended E-R Features topic in portion Database Design and the ER Model of RDBMS

Answer»

Right ANSWER is (c) Overlapping specialization

Explanation: Overlapping specialization is the TYPE of specialization that permits MULTIPLE sets. But DISJOINT specialization does not permit multiple sets. Disjoint specialization permits at most ONE set.



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