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Convert CSV to list in oracle for IN-Clause

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Last Modified: 2017-05-17
My procedure is passed a comma-separated list of IDs, for example 7369,7499,7839,7902. I tried to use it in my code like this:

declare
   p_empno_list constant varchar2(20) := '7369,7499,7839,7902';
begin
   for r in (
      select * from emp
      where  empno in (p_empno_list)
   )
   loop
      dbms_output.put_line(rpad(r.empno,9) || r.ename);
   end loop;
end;
/
but it just gives me an error:1 When SQL is expecting a character string such as SMITH, but is passed a comma-separated list such as SMITH,JONES,FORD,MILLER, no error is produced, but the query simply returns no rows.

ERROR at line 1:
ORA-01722: invalid number
ORA-06512: at line 4

How can i convert CSV to list so that it can be accepted in IN- clause?
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