试题与答案

In the following statements about function

题型:单项选择题

题目:

In the following statements about functional dependency, which one is incorrect

A.If X'

X, then X→X'.

B.If X→Y and Y'

Y, then X→Y'.

C.If X→Y and X'

X, then X'→

D.If X→Y and Y→Z, then X→

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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