Using rowconcat in where cluse

Question

hi all
i need to use rowconcat function in my where cluse
ex:
select id,name
from emp
where id in (select rowconcat('select emp_id from emp_test') from dual);
select rowconcat('select emp_id from emp_test') from dual = returned (2,10,14,20)
plz help

Answer 1

Why not:
select id,name
from emp
where id in (select emp_id from emp_test);Again, I don't know your business logic, but assuming there is a need for dynamic SQL I'd use pipelined table function:
create or replace
  type NumList
    as
      table of number
create or replace
  function num_list(
                    v_stmt varchar2
    return NumList
    pipelined
    is
        v_num number;
        v_cur sys_refcursor;
    begin
        open v_cur for stmt;
        loop
          fetch v_cur
            into v_num;
          exit when v_cur%notfound;
          pipe row(v_num);
        end loop;
        close v_cur;
        return;
end;
select  id,
        name
  from  emp
  where id in (select * from table(num_list('select emp_id from emp_test')))
/SY.
P.S. You can also make pipelined function to run in parallel.