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Home Backend Development PHP Tutorial Mysql主键自增长的问题

Mysql主键自增长的问题

Jun 23, 2016 pm 02:14 PM

是这样的,简单的mysql表,id是主键,且自增长。

id  value1    ok2    good
Copy after login


现在我把上面两条记录删除,整个表是一个空表了,然后我再加一条记录( 直接填值,不指明主键)。

他就变成了:
id  value3   new
Copy after login


id从3开始了,前面id记录被我删除了,他的id怎么从3开始呢,这个是有什么意义?


回复讨论(解决方案)

如果你用清空命令就不会从3开始了。

自增主键就是这样的,你 truncate table ; 后又从1开始了。

清空一下表,或者把auto_increment重新设置一下

delete和truncate的区别:
delete  from  表名 delete没有归位;
truncate  表名 在清空表的同时,主键自动增长值归位。
楼主如果对mysql数据库不了解,可以去看看传智韩忠康老师的mysql视频教程!

id int primary key auto_incrmement  自动增长不会删除ID ,ID不会自动归0 

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