declare        cursor csrn_monis          select *       from table2;           row_mon csrn_mon%rowtype;cursor csrn_locisselect * from table1;row_loc csrn_loc%rowtype;cursor csrn_delisselect xh from table1 minus select xh from table2;row_del csrn_del%rowtype;cursor csrn_insisselect xh from table2 minus select xh from table1;row_ins csrn_ins%rowtype;begin            for row_mon in csrn_mon loop               for row_loc in csrn_loc loop          if row_loc.xh = row_mon.xh then           dbms_output.put_line(‘更新信息:‘ || row_loc.xh);        end if;    end loop;end loop;for row_del in csrn_del loop    dbms_output.put_line(‘删除信息:‘ || row_del.xh);end loop;for row_ins in csrn_ins loop    dbms_output.put_line(‘插入信息:‘ || row_ins.xh);end loop;end;