How to use reverse function in FOR loop

Question

Hi,
Can we use REVERSE function in for loop.
If so can u please give an explanation with some example.
Thanks in advance.
Satya.

Answer 1

In SQL you could do this...
SQL> ed
Wrote file afiedt.buf
  1  select empno, ename, replace(sys_connect_by_path(ch,'|'),'|') as rev_ename
  2  from (
  3    select empno, ename, case when rn <= length(ename) then substr(ename, length(ename)-rn+1, 1) else null end as ch, rn
  4    from emp
  5        ,(select rownum as rn from dual connect by rownum <= (select max(length(ename)) from emp))
  6    where case when rn <= length(ename) then substr(ename, length(ename)-rn+1, 1) else null end is not null
  7    )
  8  where connect_by_isleaf = 1
  9  connect by empno = prior empno and rn = prior rn + 1
10  start with rn = 1
11* order by empno
SQL> /
     EMPNO ENAME      REV_ENAME
      7369 SMITH      HTIMS
      7499 ALLEN      NELLA
      7521 WARD       DRAW
      7566 JONES      SENOJ
      7654 MARTIN     NITRAM
      7698 BLAKE      EKALB
      7782 CLARK      KRALC
      7788 SCOTT      TTOCS
      7839 KING       GNIK
      7844 TURNER     RENRUT
      7876 ADAMS      SMADA
      7900 JAMES      SEMAJ
      7902 FORD       DROF
      7934 MILLER     RELLIM
14 rows selected.
SQL>