Level queries

To get the higher manager of a particular employee


select yy.empno,yy.mgr,yy.ename,rt.empno,rt.mgr,rt.ename from
(select * from emp t
connect by prior t.empno=t.mgr start with mgr is null) yy,
emp rt
where yy.empno=rt.mgr --and rt.empno=7782

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To get repeating data

select deptno,dname,loc,ltrim(ename,' ,') ename,ltrim(hiredate,' ,') hiredate,ltrim(mgr,' ,') mgr
,ltrim(job,' ,') job
from (
select deptno,dname,loc,SYS_CONNECT_BY_PATH (ename,' ,') ename,SYS_CONNECT_BY_PATH (hiredate,' ,') hiredate,
SYS_CONNECT_BY_PATH (job,' ,') job,SYS_CONNECT_BY_PATH (mgr,' ,') mgr
from (
select r.deptno,r.dname,r.loc,e.ename,e.job,e.mgr,e.hiredate,e.sal,e.comm ,
row_number() over (partition by r.deptno order by r.deptno) r,
row_number() over (partition by r.deptno order by r.deptno) -1 c
from scott.dept r,scott.emp e
where r.deptno=10 and e.deptno=r.deptno
) start with r = 1
connect by c = prior r
order by rownum desc)
where rownum = 1 ;


OR


select r.deptno,r.dname,r.loc,wmsys.wm_concat(e.ename),wmsys.wm_concat(e.job),wmsys.wm_concat(e.mgr),wmsys.wm_concat(e.hiredate),wmsys.wm_concat(e.sal),wmsys.wm_concat(e.comm)
from scott.dept r,scott.emp e
where r.deptno=10 and e.deptno=r.deptno
group by r.deptno,r.dname,r.loc