Replaace values in the columns reverse direction

Question

Oracle 11.2.0.1
Windows
create table test
code varchar2(2),
col1 varchar2(2),
col2 varchar2(2),
col3 varchar2(2),
col4 varchar2(2),
col5 varchar2(2),
col6 varchar2(2)
insert into test values ('01','K','P','O','R',null,null);
insert into test values ('02','I','S','L',null,null,null);
insert into test values ('03','P',null,null,null,null,null);
insert into test values ('04','K','N',null,null,null,null);
insert into test values ('05','K','N','Z','G','H','T');
SQL> select * from test;
CO CO CO CO CO CO CO
01 K  P  O  R
02 I  S  L
03 P
04 K  N
05 K  N  Z  G  H  T
Required Output :  (Reverse Values in the columns)
CO CO CO CO CO CO CO
01 R  O  P  K
02 L  S  I
03 P
04 N  K
05 T  H  G  Z  N  K
Thanks.

Answer 1

with
test as
(select '01' code,'K' col1,'P' col2,'O' col3,'R' col4,null col5,null col6 from dual union all
select '02','I','S','L',null,null,null from dual union all
select '03','P',null,null,null,null,null from dual union all
select '04','K','N',null,null,null,null from dual union all
select '05','K','N','Z','G','H','T' from dual
select code,
       substr(cols,instr(cols,'|',-1,2) + 1,instr(cols,'|',-1,1) - instr(cols,'|',-1,2) - 1) col1,
       substr(cols,instr(cols,'|',-1,3) + 1,instr(cols,'|',-1,2) - instr(cols,'|',-1,3) - 1) col2,
       substr(cols,instr(cols,'|',-1,4) + 1,instr(cols,'|',-1,3) - instr(cols,'|',-1,4) - 1) col3,
       substr(cols,instr(cols,'|',-1,5) + 1,instr(cols,'|',-1,4) - instr(cols,'|',-1,5) - 1) col4,
       substr(cols,instr(cols,'|',-1,6) + 1,instr(cols,'|',-1,5) - instr(cols,'|',-1,6) - 1) col5,
       substr(cols,instr(cols,'|',-1,7) + 1,instr(cols,'|',-1,6) - instr(cols,'|',-1,7) - 1) col6
  from (select code,rtrim('|'||col1||'|'||col2||'|'||col3||'|'||col4||'|'||col5||'|'||col6,'|')||'|' cols
          from test
CODE
COL1
COL2
COL3
COL4
COL5
COL6
01
R
O
P
K
02
L
S
I
03
P
04
N
K
05
T
H
G
Z
N
K
Regards
Etbin