McqMate
| Q. |
BCNF is needed because |
| A. | otherwise tuples may be duplicated |
| B. | when a data is deleted tuples may be lost |
| C. | updating is otherwise difficult |
| D. | when there is dependent attributes in two possible composite keys one of the attributes is unnecessarily duplicated in the tuples |
| Answer» D. when there is dependent attributes in two possible composite keys one of the attributes is unnecessarily duplicated in the tuples | |
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