Let the following relation schemas be given: R = (A, B, C) S = (D, E, F)
Question:
Let the following relation schemas be given:
R = (A, B, C)
S = (D, E, F)
Let relations r(R) and s(S) be given. Give an expression in SQL that is equivalent to each of the following queries.
a. п A(r)
b. σB = 17 (r)
c. r × s
d. IIA, F (σC =D(r × s))
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