题目内容

如何保证表中某列数据的唯一性()。

A. 用户输入时确保不输入重复数据
B. 将此列设为主键
C. 为此列设置唯一性约束
D. 检查并删除表中的重复数据

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C. With a stub zone for the fourthcoffee.com DNS zone hosted by the ISP
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个别资本增大的途径是()。

A. 资本的扩散
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E. 资本的集中

在移动网中,路由区由()来标识。

A. MCC
B. MNC
C. LAI
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