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Recent activity by aamna
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MadeEasy Test Series: Databases - Relational Algebra
Consider the relations R(A, B) and S(B,C). Which one of the following can evaluate differently than the others? a) πA(R) - ( πA (R - πA,B(R⋈S))) b) πA(R∩ (πA(R) x πB(S))) c) πA( (R x πc(S)) ∩ (πA(R) ... attribute. option c and d represent same query i am not sure about a and b i think option a is same query what are both options representing ??
Consider the relations R(A, B) and S(B,C). Which one of the following can evaluate differently than the others?a) πA(R) - ( πA (R - πA,B(R⋈S)))b) πA(R∩ (πA(R)...
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Oct 20, 2017
Databases
made-easy-test-series
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