A.
若T(R)=10000, T(S)=50000, V(R, Y) = 500, V(S, Y)=1000,则连接运算的代价估计为500,000;
B.
若T(R)=10000, T(S)=50000, V(R, Y) = 500, V(S, Y)=1000,则连接运算的代价估计为1,000,000;
C.
若T(R)=10000, T(S)=50000, V(R, Y) = 1000, V(S, Y)=500,则连接运算的代价估计为1,000,000;
D.
若T(R)=10000, T(S)=50000, V(R, Y) = 2000, V(S, Y)=1000,则连接运算的代价估计为500,000;