Show the following rule for MVD's. The attributes are arbitrary sets X, Y, Z and the...

Question

Question

Show the following rule for MVD's. The attributes

engineering Computer-Science

Answer 1

Answer #1

For the relation R whose schema is the set of attributes {A, B, C, D} with functional dependencies A → B and B → C, the result obtained by decomposing R according to A → B and the result obtained by expanding the BCNF violation to A → BC is same.
It is same because both A → B and A → BC has A on the left side and part of the decomposition process involves finding {A}⁺ to form one decomposed relation and A plus the rest of attributes not in {A}⁺ as the second relation.
The decomposed relations in both the cases are same.

Answer 2

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