清空表 truncate及delete区别

如何使用truncate命令，以及delete 与truncate的区别
下面看一款删除mysql一个表中所有数据实例。

truncate table mytable;

利用truncate 清空表，表的id从1开始。

下面测试实例

create table `user` (?
`id` int(11) not null auto_increment,
`name` varchar(100) default null,
?primary key (`id`))
?
插入几条数据

insert into user (name) values ('bob');
insert into user (name) values ('mark');
insert into user (name) values ('alex');
insert into user (name) values ('julia');

查看一下看数据

select * from user; the result is:id???????? name??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? 1????????? bob??????? 2????????? mark
??3????????? alex??????? 4????????? julia?

看一下truncate实例

truncate table user;

插入一条数据

insert into user (name) values ('bill');

查看结果

select * from user;
the result is:id???????? name????????????? 1????????? bill

正如你可以看到旧的记录被删除除，而新的得到的id字段1