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【简答题】an author 2. a speaker 3. a trainer 4. a consultant A someone who talks at public B someone who helps people to improve at a sport , skill or school subject C someone who advises people on...
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若R∈2NF,则R∈3NF
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若R∈1NF,则R不属于BCNF
C.
若R∈3NF,则R∈BCNF
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若R∈BCNF,则R∈3NF
【单选题】根据数据库规范化理论,下面命题中正确的是( )
A.
若R∈2NF,则R∈3NF
B.
若R∈BCNF,则R∈3NF
C.
若R∈1NF,则R不属于BCNF
D.
若R∈3NF,则R∈BCNF
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わけ
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