用游标实现，我觉得绝对这种方法比较安全的。
--首先定一个游标把需要用到的一些数据存放到游标中:
相关操作代码如下：

declare
  CURSOR D_CURSOR_CUS_INFO IS
    select t3.id_           as id_,
           t3.owe_money_    as owe_money_,
           a.heatingArea    as heating_area_
    from T_CUS_OWE_MONEY_2 t2
    left join T_CUS_OWE_MONEY_3 t3 on t2.id_= t3.id_
    left join (select s.bh,  sum(
           case
                 when s.stkbz='0' then nvl(s.mj,0)
                 when s.stkbz='1' then 0-nvl(s.mj,0)
           end
      ) as heatingArea from  sk s  where s.nd = '2008-2009' group by s.bh) a on t2.bh_=a.bh
  where  t3.owe_money_- t2.owe_money_  = a.heatingArea*5 and t3.OWE_MONEY_ > 0;

begin
        FOR everyRow IN D_CURSOR_CUS_INFO
        loop
         update T_CUS_YEAR_STATUS t
             set t.HEATING_AREA_ = everyRow.HEATING_AREA_,
                 t.OWE_MONEY_    = everyRow.owe_money_
             where t.YEAR_ = '2008-2009'
                   and t.id_ = everyRow.id_;
       end loop;
      commit;
end;

浅析常用数据库的自增字段创建方法汇总

本篇文章是对常用数据库的自增字段创建方法进行了全面的汇总介绍，需要的兄弟姐妹参考下

数据库,自增字段,创建