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【单选题】
如果关系模式R所有属性的值域中每一个值都不可再分解，并且R中每一个非主属性完全函数依赖于R的某个候选键，则R属于( )。
A.
1NF
B.
2NF
C.
3NF
D.
BCNF
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B.
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C.
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D.
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A.
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B.
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C.
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【单选题】Gary is a distinguished looking man with a touch of gray at the temples. Even in his early 50s, he still turns heads. He enjoys spending most of his time admiring his profile in the mirror. In fact, h...
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查看完整题目与答案
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查看完整题目与答案