采用的是下面的方法可删除,假设重复的是test数据库中的title字段
create table bak as (select * from test group by title having count(*)=1);
insert into bak (select * from test group by title having count(*)>1);
truncate table test;
insert into test select * from bak;
删除mysql数据库中的重复数据记录
原文：http://www.jb51.net/article/14835.htm
