Question: 2 . R 1 ( A , B , C ) , R 2 ( C , D , E ) , R 3 (

2.R1(A,B,C),R2(C,D,E),R3(E,F).V(A,R) R A .V(C,R1)=900,V(C,R2)=1,100,V(E,R2)=50,V(E,R3)=100 R 11,000, R21,500, R3750,.
(22
1) R1 join R2 join R3||.(12)
R1 join R2, R2 join R3.
(10)
2 . R 1 ( A , B , C ) , R 2 ( C , D , E ) , R 3 (

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