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

select * from tbak where rownum <&dd order by 1 desc;
order by 1 的1是什么意思啊.tbak是系统预定义的表吗

[解决办法]

SQL code

--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。