kirklandL
14.02.2020 •
Mathematics
Given two relations R1 and R2, where R1 contains N1 tuples, R2 contains N2 tuples, and N2 > N1 > 0, give the minimum and maximum possible sizes (in tuples) for the resulting relation produced by each of the following relational algebra expressions. In eachcase, state any assumptions about the schemas for R1 and R2 needed to make the expressionmeaningful:
(1) R1 U R2,
(2) R1 n R2,
(3) R1 R2,
(4) R1 x R2,
(5) (Ta=5(R1),
(6) 7T a (R1), and
(7) R1/ R2
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Ответ:
We are supped to solve for y so it will be division because that's the inverse for x. so: x/4 is your answer.