我的ORACLE一个包内有两个重载的过程分别是：
procedure peoplegrade(use_sname char, use_cno char, use_grade smallint);
procedure peoplegrade(use_sno number, use_cno char, use_grade smallint);
想实现重载，因为输入的数量都是一样的，第一个输入分别是char和number型，我认为系统能够识别，但是测试代码
declare
-- Local variables here
i number;
begin
-- Test statements here
student_yk.peoplegrade('0001','009','97');
end;
系统提示有太多的方法符合，就是说系统是没有正确重载，请问我是需要改包内的过程还是修改测试代码，怎么改，谢谢
------解决方案--------------------
Connected to Oracle Database 11g Enterprise Edition Release 11.1.0.6.0
Connected as scott
SQL>
SQL> create or replace package pak is
2 procedure p(a number);
3 procedure p(a char);
4 end pak;
5 /
Package created
SQL>
SQL> create or replace package body pak is
2 procedure p(a number) is
3 begin
4 dbms_output.put_line(a);
5 end;
6 procedure p(a char) is
7 begin
8 dbms_output.put_line('aaaaa' ||a);
9 end;
10 end pak;
11 /
Package body created
SQL> set serveroutput on
SQL> exec pak.p(1);
1
PL/SQL procedure successfully completed
SQL> exec pak.p('1');
aaaaa1
PL/SQL procedure successfully completed