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UGC-NET | UGC NET CS 2016 Aug – III | Question 12
  • Last Updated : 13 Apr, 2018

Which one of the following pairs is correctly matched in the context of database design?
12
(A) (1)
(B) (2)
(C) (3)
(D) (4)


Answer: (D)

Explanation:

  • Result of taking a subset of a higher-level entity set to form a lower-level entity set is Specialization
  • Result of taking the union of two or more disjoint(lower-level) entity sets to produce a higher-level entity set is Generalization
  • An abstraction in which relationship sets (along with their associated entity sets) are treated as higher-level entity sets, and can participate in relationships.Aggregation
  • Express the number of entities to which another entity can be associated via a relationship set Mapping cardinalities

So, option (D) is correct.

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