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题目内容
（请给出正确答案）
In the following statements about functional dependency, which one is incorrect?
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.
参考答案
更多 “ In the following statements about functional dependency, which one is incorrect?A．Ifthen X→X'.B．If X→Y andthen X→Y'.C．If X→Y andthen X'→Y.D．If X→Y and Y→Z, then X→Z. ” 相关考题
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