ROWID in a TRIGGER

Question

Hi,
I have an AFTER UPDATE TRIGGER but need to track each row which is updated.
Following is the simple example:
need to get the EMPNO whenever there is change in DEPTNO for an employee in EMP.
CREATE OR REPLACE TRIGGER ed_chg
AFTER UPDATE ON emp
FOR EACH ROW
begin
if updating then
select empno into v_empno from emp
where deptno=:new.empno;
dbms_output.put_line('The employee who had a change in Dept : '||v_empno);
--the above one will give an error of too_many_rows. so need to track only that row which is updated.
end if;
end;

Answer 1

Maybe something like this ?
TEST@db102 SQL> CREATE OR REPLACE TRIGGER ed_chg
  2  AFTER UPDATE ON emp
  3  FOR EACH ROW
  4  begin
  5     if :new.deptno != :old.deptno then
  6             dbms_output.put_line('The employee who had a change in Dept : '||:new.empno);
  7     end if;
  8* end;
TEST@db102 SQL> /
Trigger created.
TEST@db102 SQL> set serveroutput on
TEST@db102 SQL> update emp set deptno=10 where empno=7902;
The employee who had a change in Dept : 7902
1 row updated.
TEST@db102 SQL>