GATE | CS | 2012 | Databases | Relational Algebra | Question 43 (original) (raw)

Suppose (

A

, B) and (

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?

DBMSGATE2012

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