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I have a relation looks like:

R = (X,Y,C,D)

and functional dependencies:

FD = {XY -> CD, YC -> D, D -> X}

I found out that the candidate keys are XY, YC, YD.

In this case, I have 3 candidate keys... so how do I use them when I decompose the relation into BCNF? I've never done decomposition of the relation with more than one key...

Thanks.

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2 に答える 2

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関係 1: (Y,C,D) 関係 2: (D,X)

于 2013-03-21T22:18:29.580 に答える