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UGC-NET | UGC NET CS 2017 Jan – III | Question 9
  • Difficulty Level : Medium
  • Last Updated : 27 Mar, 2018

Let pk(R) denotes primary key of relation R. A many-to-one relationship that exists between two relations R1 and R2 can be expressed as follows :
(A) pk(R2) → pk(R1)
(B) pk(R1) → pk(R2)
(C) pk(R2) → R1 ∩ R2
(D) pk(R1) → R1 ∩ R2


Answer: (B)

Explanation:

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