行转列

  col1             col2  
  -----------------  
  0001             Tom  
  0001             Jack  
  0001             Mike  
  0002             Kate  
  0002             Rose  
  0002             Fene  
   
  如何用一条SQL语句得到如下结果：  
  col1           col2  
  -----------------  
  0001           Tom,Jack,Mike  
  0002           Kate,Rose,Fene  
 
 创建自定义函数：  
create or replace function f_ename(jobno in varchar2) return varchar2    
is               
 str_return     varchar2(200);      
 cursor c_ename(v_jobno varchar2) is select ename from emp where job=v_jobno;      
begin      
 for str_temp in c_ename(jobno) loop      
  str_return:=str_return||str_temp.ename;      
 end loop;      
 return str_return;      
end;      
/      
   
调用：  
select job,f_ename(job) from (select distinct job from emp);