Consider a relation schema R = (U, V, W, X, Y, Z), on which the following functional dependencies hold:
(U → V, VW → X, Y → W; X → U}
The candidate keys of R are:
1
UY, VY
2
UY, VY, XY
3
UYZ, VYZ, VWZ
4
UYZ, VYZ, XYZ
Consider a relation schema R = (U, V, W, X, Y, Z), on which the following functional dependencies hold:
(U → V, VW → X, Y → W; X → U}
The candidate keys of R are: