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) ands(S) be given. Give expressions in QBE, and Data log equivalent to each of the following queries:
a. IIA(r)
b. σB =17 (r)
c. r × sd.
d. IIA,F (σC =D(r × s))
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