Oracle中创建表，行级触发器，序列

create table TPointManage
(
  PointManageSn  NUMBER(14) not null,   --积分流水号
  ghmembersn        NUMBER(8),           ----总部卡帐户流水号 
  mpointsum    NUMBER(8),                ------累计积分
  CREATEDBY     NUMBER(8),               -------创建人
  CREATEDON     DATE,                    -------创建时间
  LASTUPDATEDBY NUMBER(8),               -------修改人
  LASTUPDATEDON DATE,                    --------修改时间    
  FLAG          NCHAR(1)                 ----是否有效0有效，1注销
)

create or replace trigger TI_PointManage --创建行级触发器
before insert on TPointManage
REFERENCING OLD AS old_value NEW AS
    new_value
    FOR EACH ROW
when (new_value.PointManageSn is null)
BEGIN
 select PointManage_PointManageSn.nextval into :new_value.PointManageSn from dual;
END;

-- Create sequence
create sequence PointManage_PointManageSn
minvalue 1
maxvalue 999999999999999999999999999
start with 1
increment by 1
cache 20;