如何向 MySQL 表添加主键? [英] How to add a primary key to a MySQL table?

问题描述

这是我尝试过但失败的方法:

This is what I tried but it fails:

alter table goods add column `id` int(10) unsigned primary AUTO_INCREMENT;

有人给个提示吗?

推荐答案

添加列后，可以随时添加主键:

After adding the column, you can always add the primary key:

ALTER TABLE 商品ADD PRIMARY KEY(id)

至于为什么你的脚本不起作用，你需要指定PRIMARY KEY，而不仅仅是PRIMARY这个词:

As to why your script wasn't working, you need to specify PRIMARY KEY, not just the word PRIMARY:

alter table goods add column `id` int(10) unsigned primary KEY AUTO_INCREMENT;

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