Give an expression in SQL that is equivalent to each of the following queries.

(6 points)Let the following relation schemas be given:

 

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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. s B = 4 AND A>2500 (R)

b. PA, D (s D=500 AND A=F (R ´ S))

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