Pivot Query on Oracle 10g

Question

Table Structure
GRP_NR Values
1 A
1 B
2 A
2 B
2 C
3 A
3 B
3 C
N A
N B
N C
I would like to convert the above structure into the following. I prefer to have it as sql query, but open to plsql solution too.
1 2 3 ..................... N
A A A ..................... A
B B B ..................... B
. C C ..................... C
I am finding it quite a challenge to do it. especially to make it dynamic.
I will appreciate your help.

Answer 1

With model clause.
Regards salim.
select GRP_NR, substr( string, 2 ) as string
from t
model
return updated rows
partition by ( GRP_NR )
dimension by ( row_number() over (partition by GRP_NR ORDER BY val asc) as position )
measures ( cast( val as varchar2(1000) ) as string )
rules
upsert
iterate(1000 )
until ( presentv(string[iteration_number+2],1,0) = 0 )
( string[0] = string[0] || ',' || string[iteration_number+1] )
order by GRP_NR ;
SQL> with t as (
  2  select 1 GRP_NR, 'A' val from dual union all
  3  select 1 ,'B' val from dual union all
  4  select 2 ,'A' val from dual union all
  5  select 2 ,'B' val from dual union all
  6  select 2 ,'C' val from dual union all
  7  select 3 ,'A' val from dual union all
  8  select 3 ,'B' val from dual union all
  9  select 3 ,'C' val from dual )
10  select GRP_NR, substr( string, 2 ) as string
11  from t
12  model
13  return updated rows
14  partition by ( GRP_NR )
15  dimension by ( row_number() over (partition by GRP_NR ORDER BY val asc) as position )
16  measures ( cast( val as varchar2(1000) ) as string )
17  rules
18  upsert
19  iterate(1000 )
20  until ( presentv(string[iteration_number+2],1,0) = 0 )
21  ( string[0] = string[0] || ',' || string[iteration_number+1] )
22  order by GRP_NR ;
    GRP_NR STRING
         1 A,B
         2 A,B,C
         3 A,B,C
SQL>