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Suppose two FD’s are given
W ->X and W->Y

can we derive by replacing left hand side attribute?
Are X->Y and Y->X are also valid?
in Databases by (85 points) | 15 views

1 Answer

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W ->X and W->Y mean W can determine X uniquely and W can determine Y uniquely, respectively.

Closure set of W will be {W,X,Y}

Closure set of X will be {X}

Closure set of Y will be{Y}


W ->X and W->Y means this:-

W   X   Y

a1 b1  c1

a2 b1  c2

a1 b1 c1

It doesnt satisfy X->Y
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