Question
relation R(ABCD) has these dependencies {A → B, B →
C,C → D} and it is decomposed into three relations R1(AB) , R2(BC), AND R3(CD). State true or false if the decomposition is dependency preserving or not?Solution
The decomposition is dependency preserving. Because the union of all the functional dependencies from R1, R2 AND R3 is equal to the dependencies that are in relation R.
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