oracle 中 date类型的在数据库怎么存入

insert into tabname(datecol) value(sysdate) ;  -- 用date值
insert into tabname(datecol) value(sysdate+1) ;  -- 用date值
insert into tabname(datecol) value(to_date('2014-02-14','yyyy-mm-dd')) ;  -- 用to_date
insert into tabname(datecol) value(to_date('2014-02-14 20:47:00','yyyy-mm-dd hh24:mi:ss')) ;  -- 用to_date
insert into tabname(datecol) value(to_date('20140214','yyyymmdd')) ;  -- 用to_date
insert into tabname(datecol) value(to_date('20140214204700','yyyymmddhh24miss')) ;  -- 用to_date