mysql删除重复记录

1，子查询

delete from m_sens_dict where id not in ( select dup.id from ( select id from m_sens_dict group by name ) as dup ) ;

2，左联接

delete msd.* from m_sens_dict as msd left join ( select msd_l.id from m_sens_dict as msd_l group by msd_l.name) as dis_d on msd.id=dis_d.id where dis_d.id is null;

2，内联接（需要操作多次）

delete msd.* from m_sens_dict as msd inner join ( select msd_l.id from m_sens_dict as msd_l group by msd_l.name having(count(*) > 1) ) as dis_d on msd.id=dis_d.id ;