随机删除重复数据

delete from users where id = (select t.id from (select * from users u where u.real_name in (select real_name from users group by real_name having count(real_name ) > 1) 
and u.platform_type in (select platform_type  from users group by platform_type having count(platform_type) > 1)
and u.user_password in (select user_password   from users group by user_password having count(user_password ) > 1) order by rand() limit 1 )as t)