Same old question (rows to columns using pl/sql)

Question

Hi all,
i am re-posting the same requirement, please do the needful.
I need a query to convert row value into column delimited by space.
Dont need any column names just values.
create table tb_row_2_col (id number,val varchar2(100));
insert into tb_row_2_col values (1,'col1');
insert into tb_row_2_col values (1,'col2');
insert into tb_row_2_col values (1,'col3');
insert into tb_row_2_col values (2,'col4');
insert into tb_row_2_col values (2,'col5');
commit;
SQL> select * from tb_row_2_col;
ID VAL
1 col1
1 col2
1 col3
2 col4
2 col5
SQL>
if i execute a query the output should be like this. Please dont used decode/case.
need to use loop to do the needful.
1 col1 col2 col3
2 col4 col5
Priya.

Answer 1

I doubted PL/SQL will be much faster, bjut here it goes:
declare
    v_id number;
    v_prev_id number;
    v_val varchar2(100);
    v_combined_val varchar2(4000);
    cursor v_cur is select id,val from tb_row_2_col order by id,val;
begin
    open v_cur;
    fetch v_cur into v_prev_id,v_combined_val;
    loop
      fetch v_cur into v_id,v_val;
      exit when v_cur%notfound;
      if v_id = v_prev_id
        then
          v_combined_val := v_combined_val || ' ' || v_val;
        else
          dbms_output.put_line(rpad(v_prev_id,5) || v_combined_val);
          v_prev_id := v_id;
          v_combined_val := v_val;
      end if;
    end loop;
    dbms_output.put_line(rpad(v_prev_id,5) || v_combined_val);
    close v_cur;
end;
1    col1 col2 col3
2    col4 col5
PL/SQL procedure successfully completed.
SQL> SY.