Trigger validation for upat event in row level

Question

Hi,
i have a emp table with 100 columns.Iwrote  a trigger for insert and update like bellow.
create or replace trigge t_emp
AFTER INSERT OR UPDATE ON  emp
  REFERENCING NEW AS NEW OLD AS OLD 
FOR EACH ROW 
BEGIN
if inserting then
insert into emp_temp1 values(:new.1,:new.2.....);
elsif updating then
insert into emp_temp2 values(:new.1,:new.2...);
end if;
end;
for insert and update i am able to get records perfect.My problem is if i open a record in emp and modify the colum with same value then also i am getting record into emp_temp2.i don't want duplicate so if i wrote like bellow
IF :OLD.1<>:NEW1 OR :OLD.2<>:NEW.2 like  then i won't get duplicate but there are 100's of columns is there .So is there any alternative for record level validation.
remember here is no primary keys...

Answer 1

Either check all your columns or create a primary key or unique constraint or unique index