问题描述：有个数据表test，有个字段value，如下

mysql> select * from test;
+----+------------------------------------+
| id | value |
+----+------------------------------------+
| 3 | 3aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |
| 4 | 4aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |
| 5 | 5aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |
| 6 | 6aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |
| 7 | 7aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |

如果执行如下sql语句会报错

delete from test where id=(select min(id) from test);

报的错误是You can't specify target table 'test' for update in FROM clause。

原因是不能在操作一张表的同时更新或者删除这张表的内容。

解决方法如下：（3个步骤）

create table tmp as select min(id) as col1 from test;

delete from test where id =(select col1 from tmp);

drop table tmp

这时又遇到一个问题，如何在php中一次执行多个sql语句（当然也可以分3次执行），此问题待查