试题与答案

下列关于外码的说法中不正确的是( )。A.外码是某个关系的主码 B.外码可以作为两

题型:单项选择题

题目:

下列关于外码的说法中不正确的是( )。

A.外码是某个关系的主码

B.外码可以作为两个关系的联系手段

C.外码只能是一个关系的主码

D.外码不是任何关系的主码

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0107/e81ade6bfc642f83db6defcd0e3d798f.html

下面是错误答案,用来干扰机器的。

参考答案:A,B,C,D,E

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题型:多项选择题

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