Let us assume that a relation R (A, B, C, D, E) with set of functional dependencies F = {A → BC, C → D} is decomposed into relations R1 (A, B, and R2 (A, D, E). This decomposition is ___________.
A. Lossless join decomposition
B. Dependency preserving decomposition
C. Not a dependency preserving decomposition
D. Lossy decomposition
Answer:A
Let us assume that a relation R (A, B, C, D, E) with set of functional dependencies F = {A → BC, C → D} is decomposed into relations R1 (A, B, and R2 (A, D, E). This decomposition is ___________.
A. Lossless join decomposition B. Dependency preserving decomposition C. Not a dependency preserving decomposition D. Lossy decomposition