Column to row

Question

How to convert column to row in Oracle 10g.
Input
WB
CB
IT
CARDS
Output should be as follows.
WB|CB|IT|CARDS

Answer 1

declare
          var_result emp.ename%type := null;
begin
     for i in (select ename from emp)
     loop
          if i.ename is not null then
               var_result := var_result ||'|'|| i.ename ;
          else      
               var_result := var_result ;
          end if;
     end loop;
     var_result := substr(var_result,2) ;
     dbms_output.put_line('result is: '||var_result);
end;