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[问与答] 订单表在设计的时候已经有订单编号作为唯一字段了，还需要 id 列吗

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今天在设计订单表，订单表在设计的时候已经有订单编号作为唯一字段了，那是不是就可以删除 id 字段，把订单编号设置为主键了

这样来看 id 列好像确实没什么用。。。

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