相关疑难解决方法(0)

我的访问表如下:

insert into Visit
values(12, to_date('19-JUN-13', 'dd-mon-yy'), to_date('19-JUN-13 12:00 A.M.' , 'dd-mon-yy hh:mi A.M.'));
insert into Visit
values(15, to_date('20-JUN-13', 'dd-mon-yy'), to_date('20-JUN-13 02:00 A.M.' , 'dd-mon-yy hh:mi A.M.'));
insert into Visit
values(18, to_date('21-JUN-13', 'dd-mon-yy'), to_date('21-JUN-13 10:30 A.M.' , 'dd-mon-yy hh:mi A.M.'));

当我尝试查询它时: select * from Visit我得到:

SQL> select * from visit;

   SLOTNUM DATEVISIT ACTUALARRIVALTIME                                                                                                                                                                                                                                                                                                                                                                                 
---------- --------- ------------------------------                                                                                                                                                                                                                                                                                                                                                                     
        12 19-JUN-13 19-JUN-13                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
        15 20-JUN-13 20-JUN-13                                                                                                                                                                                                       
        18 21-JUN-13 21-JUN-13                                                                                                                                                                                                      

SQL> spool off;

怎么没有时间？