海量数据（百万以上），其中有些全部字段都相同，有些部分字段相同，怎样高效去除重复？

如果要删除手机(mobilePhone)，电话(officePhone)，邮件(email)同时都相同的数据，以前一直使用这条语句进行去重：

delete from 表 where id not in
(select max(id) from 表 group by mobilePhone,officePhone,email )
or
delete from 表 where id not in
(select min(id) from 表 group by mobilePhone,officePhone,email )

delete from 表 where id not in
(select max(id) from 表 group by mobilePhone,officePhone,email )
or
delete from 表 where id not in
(select min(id) from 表 group by mobilePhone,officePhone,email )