select * from tbak where rownum <&dd order by 1 desc;该怎么解决

--例如：
select a,b,c,d,e,f,g from t order by 1,3,5;
--等价于
select a,b,c,d,e,f,g from t order by a,c,e;


select a,m,d,c,b from t order by 1,3,5;
--等价于
select a,m,d,c,b from t order by a,d,b;

说白了就是前面select 中的字段顺序对应的字段。