Database Systems 2nd edition by Hector Garcia-Molina

X X.c < Y.c Y

Join X and Y on C where X.c < Y.c

Table looks as follows:

X(b, c) Y(c, d)

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T(X) = 200 T(Y) = 300

V(X, b) = 50 V(Y, c) = 40

V(X, c) = 100 V(Y, d) = 50