MCQOPTIONS
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MCQOPTIONS
| 1. |
Given relations r(w, x) and s(y, z), the result ofSELECT DISTINCT w, x FROM r, s is guaranteed to be same as r, provided |
| A. | r has no duplicates and s is non-empty |
| B. | r and s have no duplicates |
| C. | s has no duplicates and r is non-empty |
| D. | r and s have the same number of tuples |
| Answer» B. r and s have no duplicates | |