If you are using a single public branch a simple timestamp or auto-incrementing version number would be sufficient.
如果针对单一的公共主干代码，简单的时间戳或是自增长版本号也就够了。
Like most modern databases, MySQL has the ability to create auto-incrementing unique identifiers on a per-record basis.
与大多数现代数据库一样，MySQL能够在每记录的基础上创建自动增量惟一标识符。
We also added the AUTO_INCREMENT flag to indicate that the field is auto-incrementing, as well as the PRIMARY KEY flag to indicate which field is an id.
我们还添加了AUTO_INCREMENT标志来指示字段是自动增量的，添加primary KEY标志来指示那个字段是一个id。
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