Let R = (A, B, C), and let r1 and r2 both be relations on schema R.
Question:
Let R = (A, B, C), and let r1 and r2 both be relations on schema R. Give an expression in the domain relational calculus that is equivalent to each of the following:
a. IIA(r1)
b. σB =17 (r1)
c. r1 ∪ r2
d. r1 ∩ r2
e. r1 − r2
f. IIA,B(r1) 1 ΠB,C(r2)
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