create trigger biufer_employees_department_id
before insert or update
of department_id
on employees
referencing old as old_value
new as new_value
for each row
when (new_value.department_id<>80 )
begin
:new_value.commission_pct :=0;
end;
/

create trigger biufer_employees_department_id

biufer(before insert update for each row)

when (new_value.department_id<>80 )

when (new_value.department_id<>80 )

begin

insert into employees(employee_id,

Create table foo(a number);
Create trigger biud_foo
Before insert or update or delete
On foo
Begin
If user not in (‘DONNY’) then
Raise_application_error(-20001, ‘You don’t have access to modify this table.’);
End if;
End;
/

create table employees_log(

Create or replace trigger biud_employee_copy
Before insert or update or delete
On employees_copy
Begin
Insert into employees_log(
Who,when)
Values( user, sysdate);
End;
/

update employees_copy set salary= salary*1.1;

begin
if inserting then
-----
elsif updating then
-----
elsif deleting then
------
end if;
end;
if updating(‘COL1’) or updating(‘COL2’) then
------
end if;

　alter table employees_log

Create or replace trigger biud_employee_copy
Before insert or update or delete
On employees_copy
Declare
L_action employees_log.action%type;
Begin
if inserting then
l_action:=’Insert’;
elsif updating then
l_action:=’Update’;
elsif deleting then
l_action:=’Delete’;
else
raise_application_error(-20001,’You should never ever get this error.’);
Insert into employees_log(
Who,action,when)
Values( user, l_action,sysdate);
End;
/

insert into employees_copy( employee_id, last_name, email, hire_date, job_id)
values(12345,’Chen’,’Donny@hotmail’,sysdate,12);
select *from employees_log