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Normalization

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Why dependency preserving decomposition into bcnf is not always possible but lossless join is possible? Give with example.
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Uchiha Kartik asked May 9
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Topic = fd's and normalization.
Q) In R(A,B,C,D)FD's {AB->CD, C->D}Is it in 3NF?Ans) Vaise to shortcut (in x->y fd either x should be super key or y should ... dependent hoti ab pe, par yaha directly bhi dependent hai transitively bhiTo isliye samjh nhi aa rhaPlease help
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