Consider a schema R(A, B, C, and functional dependencies A -> B and C -> D. Then the decomposition of R into R1 (A, B) and R2(C, is
A. dependency preserving and lossless join
B. lossless join but not dependency preserving
C. dependency preserving but not lossless join
D. not dependency preserving and not lossless join
Answer:A
Consider a schema R(A, B, C, and functional dependencies A -> B and C -> D. Then the decomposition of R into R1 (A, B) and R2(C, is
A. dependency preserving and lossless join B. lossless join but not dependency preserving C. dependency preserving but not lossless join D. not dependency preserving and not lossless join
Explanation: While decomposing a relational table we must verify the following properties: