Oracle ´¥·¢Æ÷

 
create table emp2_log(
 uname varchar2(20),
 action varchar(10),
 atime date
);
create or replace trigger trig
   after insert or delete or update on emp2 for each row  //°óÔÚÒ»ÕűíÉÏ,before after ¶¼¿É
ÒÔ,beforeÊÇ ²åÊý¾Ý֮ǰ£¬afterÊÇÖ®ºó
begin
   if inserting then
       insert into emp2_log values(USER,'insert',sysdate);
   elsif updating then
       insert into emp2_log values(USER,'update',sysdate);
   elsif deleting then
       insert into emp2_log values(USER,'delete',sysdate);
   end if;
end;
----------------
create or replace trigger trig
   after  update on emp2 for each row
begin
  update emp set deptno=:NEW.deptno where deptno=:OLD.deptno;  //  ¶ÔÓÐÍâ¼üÔ¼Êø½øÐÐÉèÖÃ
end;