GATE | CS | 2012 | Databases | Relational Algebra | Question 43

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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

A

B

C

D

This question is part of this quiz :

GATE CS 2012,ER and Relational Models,DBMS GATE CS PYQ QUIZ,Relational Algebra GATE CS PYQ Quiz
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