触发器实例 在student表中增加一列冗余列sum_grade,在sc表中作一触发器,当添加,删除,修改时,student表中sum_grade改变create or replace trigger sc_ins_del_updafter insert or delete or update of grade,sno on scfor each row declare isum_grade nu... oracle复习 2023-06-07 65 点赞 0 评论 98 浏览