海量數據（百萬以上），其中有些全部字段都相同，有些部分字段相同，怎樣高效去除重復？

如果要刪除手機(mobilePhone)，電話(officePhone)，郵件(email)同時都相同的數據，以前一直使用這條語句進行去重：

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 )