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________ is an abstraction through which relationships are treated as higher level entities(a) Creation(b) Superseding(c) Attribute separation(d) AggregationI had been asked this question during an online exam.My enquiry is from Extended E-R Features topic in section Database Design and the ER Model of RDBMS

Answer»

The correct choice is (d) AGGREGATION

The best I can explain: One LIMITATION of E-R model is that it cannot express relationships among relationships. Thus for this purpose, aggregation is used. Aggregation is an ABSTRACTION through which relationships are treated as higher LEVEL entities.



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