create trigger tri_emp
    after insert on employees
    for each row
    insert into new values（：new.sno,:new.sname,:new.sex,:new.depart）
    --------------
    create trigger tri_emp_delete
    after delete on employees
    for each row
    delete from new where sno=:old.sno
    --------------
    create trigger tri_emp_update
    after update on employees
    for each row
    begin
    delete from new where sno=:old.sno;
    insert into new values（：new.sno,:new.sname,:new.sex,:new.depart）；
    end;
    --------------
    注意；的使用，如果在begin和end子句中有多条语句的话，每条句子后面都应该有一个分号。