Oracle中序列（SEQUENCE）的使用一例

create or replace trigger TRI_SUPPLIER
  before insert on   SUPPLIER
  for each row
begin
  select seq_supid.NEXTVAL into:new.supcode from dual;
  select seq_supid.CURRVAL into:new.supID from dual;
end;

create or replace trigger TRI_SUPPLIER
  before insert on   SUPPLIER
  for each row
declare  v_supval number(20);
begin
  select  seq_supid.NEXTVAL into v_supval  from dual;
  select v_supval  into:new.supcode from dual;
  select v_supval  into:new.supID from dual;
end;