2. 计算机
  3. In the following statements about functional dependency, which one is incorrect?

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

admin2009-02-24  53
问题 In the following statements about functional dependency, which one is incorrect?
选项 A、If

then X→X’.
B、If X→Y and

then X→Y’.
C、If X→Y and

then X’→Y.
D、If X→Y and Y→Z, then X→Z.
答案C
解析
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笔试

原NCRE全国计算机四级

NCRE全国计算机四级

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