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Which relationship is used to represent a specialization entity?

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Which relationship is used to represent a specialization entity? (a) ISA (b) AIS (c) ONIS (d) WHOIS I got this question in unit test. I need to ask this question from Extended E-R Features in section Database Systems Design and Implementation of Database Management

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Correct answer is (a) ISA For explanation: In terms of an E-R diagram, specialization is depicted by a hollow arrow-head pointing from the specialized entity to the other entity.

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