Oracle自增长列

2.建序列
CREATE SEQUENCE SDE.SEQ_THM_XZYS
  START WITH 2
  MAXVALUE 9999999999999999999999999999
  MINVALUE 1
  NOCYCLE
  CACHE 20
  NOORDER;

3.建触发器
create or replace trigger TGI_THM_XZYS_ID
  before insert on SDE.THM_XZYS
  for each row
begin
    select to_char(SDE.SEQ_THM_XZYS.nextval) into:new.ID from sys.dual;
end;
/

ALTER TRIGGER TGI_THM_XZYS_ID COMPILE;
commit;