--時間加2秒
select sysdate,sysdate+(2/(60*60*24)) from dual;
--oracle隨機數10-99之間
SELECT round(dbms_random.value(10,99))FROM dual;
--計算年齡
select floor(months_between(SYSDATE,date'1986-11-09')/12) 年齡 from dual;
--複製表 不要數據
create table empinfo_1 as select * from empinfo where 1=2(隨便加個不成立的條件即可)
--複製表 附帶數據
create table empinfo_1 as select * from empinfo
--閃回查詢
select * from bd_posinfo AS OF TIMESTAMP TO_TIMESTAMP('2015-08-14 12:00:00','yyyy-mm-dd hh24:mi:ss');