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2. (4 points) Given two relation schemas P(A,B,C,D) and Q(C,E,F,G), there are two equivalent algebra expressions E1 and E2. Try to analysis and discuss which

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2. (4 points) Given two relation schemas P(A,B,C,D) and Q(C,E,F,G), there are two equivalent algebra expressions E1 and E2. Try to analysis and discuss which has better performance . E1=A(B=EG=99(PQ))E2=A(B=E(P(G=99(Q)))

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