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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