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 the tuple relational calculus that is equivalent to each of the following:
a. II A(τ)
b. σB =17 (τ)
c. τ × s
d. IIA, F (σC =D(τ × s))
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