select deptno, job, row_number() over (partition by deptno order by job) as no
from emp
order by deptno, job;
http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96520/aggreg.htm#1020
http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96540/functions2a.htm#80856
from emp
order by deptno, job;
http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96520/aggreg.htm#1020
http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96540/functions2a.htm#80856