Linux下删除大数据文件中部分字段重复行的方法

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;