How to determine if insert or update

Question

Whenever INSERT is happened in the CUSTOMER table,I need to call the \"StoredProcedure1\"and UPDATE is happend in the CUSTOMER table,I need to call the \"

Answer 1

create or replace trigger comp
before
insert or delete or update
on student
referencing old as o new as n
for each row
begin
  if deleting then
           insert into student_backup values
      (:o.studid,:o.studentname,:o.address,:o.contact_no,:o.branch,sysdate);
  end if;
  if inserting then
        insert into student_backup values
      (:n.studid,:n.studentname,:n.address,:n.contact_no,:n.branch,sysdate);
 end if;
  if updating then
       insert into student_backup values
      (:o.studid,:o.studentname,:o.address,:o.contact_no,:o.branch,sysdate);
  end if;
end comp;