Question & Answer: Consider the relation scheme R = {A, B, C, D} with functional dependencies A rightarrow C and B rightarrow D. What i…..

4. Consider the relation scheme R = {A, B ,C,D} with functional dependencies A → C and hout using closure directly. Describe your reasoning clearly).

Consider the relation scheme R = {A, B, C, D} with functional dependencies A rightarrow C and B rightarrow D. What is the only key? (You must do this problem without using closure directly. Describe your reasoning clearly).

Expert Answer

R = { A,B,C,D}

A -> C

B -> D

A determines C and B determines D, so only key should be composite key(A,B) in the relation R

There will be partial dependencies ie C is partially dependent on (A,B) and D is also partially dependent on (A,B) . The partial dependencies can be removed by normalization .

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