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  1. Suppose R1(A, B) and R2(C, D) are two relation schemas. Let r1 and r2 be the corresponding relation instances. B is a foreign key that refers to C in R2. If data in r1 and r2 satisfy referential integrity constraints, which of the following is ALWAYS TRUE?

    (A) B(r1)  C(r2) =  

    (B) C(r2)  B(r1) =  

    (C) B(r1) = C(r2)

    (D) B(r1)  C(r2) ≠  

asked Jul 2, 2016 in Database Management System by CompleteGATE-AskUS (3,550 points) | 60 views

1 Answer

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Best answer

(A) B(r1)  C(r2) =  

answered Jul 2, 2016 by ebeisaac (13,250 points)
selected Jul 11, 2016 by CompleteGATE-AskUS
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