Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 23 Sep 2017 My Price 3.00

R2 contains N2 tuples

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 result relation produced by each of the following relational algebra expressions. In each case, state any assumptions about the schemas for R1 and R2 that are needed to make the expression meaningful:

(1) R1∪R2,

(2) R1∩R2,

(3) R1-R2,

(4) R1×R2,

(5) σ α=5(R1)

(6) π α (R1)and

(7) R1/R2

 

Answers

Maurice Tutor
(5)
Status NEW Posted 23 Sep 2017 12:09 AM My Price 3.00

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