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

题库:计算机等级考试 类型:最佳选择题 时间:2021-07-10 11:40:55 免费下载:《单选题》Word试卷

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→

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