MCQOPTIONS
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| 1. |
Suppose R is a relation schema and F is a set of functional dependencies on R. Further, suppose R1 and R2 form a decomposition of R. Then the decomposition is a lossless join decomposition of R provided that: |
| A. | R1∩R2→R1 is in F+ |
| B. | R1∩R2→R2 is in F+ |
| C. | both R1∩R2→R1 and R1∩R2→R2 functional dependencies are in F+ |
| D. | at least one from R1∩R2→R1 and R1∩R2→R2 is in F+ |
| Answer» E. | |