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                                                1. 隨筆-199  評論-203  文章-11  trackbacks-0
                                                  加法 
                                                   select sysdate,add_months(sysdate,12) from dual;        --加1年
                                                   select sysdate,add_months(sysdate,1) from dual;        --加1月
                                                   select sysdate,to_char(sysdate+7,'yyyy-mm-dd HH24:MI:SS') from dual;   --加1星期
                                                   select sysdate,to_char(sysdate+1,'yyyy-mm-dd HH24:MI:SS') from dual;   --加1天
                                                   select sysdate,to_char(sysdate+1/24,'yyyy-mm-dd HH24:MI:SS') from dual;  --加1小時
                                                   select sysdate,to_char(sysdate+1/24/60,'yyyy-mm-dd HH24:MI:SS') from dual;  --加1分鐘
                                                   select sysdate,to_char(sysdate+1/24/60/60,'yyyy-mm-dd HH24:MI:SS') from dual;  --加1秒

                                                  減法
                                                   select sysdate,add_months(sysdate,-12) from dual;        --減1年
                                                   select sysdate,add_months(sysdate,-1) from dual;        --減1月
                                                   select sysdate,to_char(sysdate-7,'yyyy-mm-dd HH24:MI:SS') from dual;   --減1星期
                                                   select sysdate,to_char(sysdate-1,'yyyy-mm-dd HH24:MI:SS') from dual;   --減1天
                                                   select sysdate,to_char(sysdate-1/24,'yyyy-mm-dd HH24:MI:SS') from dual;  --減1小時
                                                   select sysdate,to_char(sysdate-1/24/60,'yyyy-mm-dd HH24:MI:SS') from dual;  --減1分鐘
                                                   select sysdate,to_char(sysdate-1/24/60/60,'yyyy-mm-dd HH24:MI:SS') from dual;  --減1秒
                                                  posted on 2011-11-11 15:34 Werther 閱讀(555) 評論(0)  編輯  收藏

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