MadeEasy Subject Test: Databases - Relational Algebra

Question

Options

A)

B)

C) Both A and B

D) None

Explain...????

Comments

I answerd both a and b,what do you think?i raised same question just now:p

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In answer it is given option B.., the reason they say is .., "in the question it is given as "only" which specifically means we need to do substraction".., but I am not convinced with explanation....!!!

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I have added my analysis here:-https://gateoverflow.in/106089/me-test-series-sql

Go through it once  if you have some time and let me know if I am wrong.

Answer 1

both a and b

Comments

Both A and B may be wrong..., It should either A or B.., Explain....!!!

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I got both a and b while solving with appropiate data

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Yeah both are correct,even i got same,but i faced same question in same test,the answer was given is only 2,which is wrong

Answer 2

Answer is B)

Bcoz A will also give those person who frequent bars in their city and can also frequent bar of another city.

Now what B) is doing is removing those guys who have frequently visited bar of another city and removing those names from Frequent relation. Then only those names will remain who have only frequented bar of their city and not any other city.