Linux下刪除大數(shù)據(jù)文件中部分字段重復(fù)行的方法

use dbname;
alter table tablename add rowid int auto_increment not null;
create table t select min(rowid) as rowid from tablename group by uniqfield;
create table t2 select tablename .* from tablename,t where tablename.rowid= t.rowid;
drop table tablename;
rename table t2 to tablename;