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If a relation with a Schema R is decomposed into two relations R1 and R2 such that (R1 ∪ R2) = R1 then which one of the following is to be satisfied for a lossless joint decomposition (→ indicates fun | |
A. | (R1 ∩ R2) → R1 or R1 ∩ R2 → R2 [Correct Answer] |
B. | R1 ∩ R2 → R1 and R1 ∩ R2 → R2 [Wrong Answer] |
C. | R1 ∩ R2 → R2 [Wrong Answer] |
D. | R1 ∩ R2 → R1 [Wrong Answer] |