Exercise 2.5.3: Suppose R and S are two relations. Let C be the referen- tial integrity constraint that says: whenever R has a tuple with some values V1, V2, ... , Vn in particular attributes A1, A2, ... , An, there must be a tuple of S that has the same values v1, v2, ... , Vn in particular attributes B1, B2,... , Bn. Show how to express constraint C in relational algebra.

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A:

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