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GATE | Gate IT 2008 | Question 59

Let R (A, B, C, D) be a relational schema with the following functional dependencies:
A → B, B → C,
C → D and D → B. 

The decomposition of R into 
(A, B), (B, C), (B, D)

(A)

gives a lossless join, and is dependency preserving

(B)

gives a lossless join, but is not dependency preserving

(C)

does not give a lossless join, but is dependency preserving

(D)

does not give a lossless join and is not dependency preserving

Answer

Please comment below if you find anything wrong in the above post
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