select trunc(to_date('2010-2-22','yyyy-mm-dd')-to_date('2010-4-13','yyyy-mm-dd')) from dual;
转载于:https://my.oschina.net/yuanke/blog/6962
select trunc(to_date('2010-2-22','yyyy-mm-dd')-to_date('2010-4-13','yyyy-mm-dd')) from dual;
转载于:https://my.oschina.net/yuanke/blog/6962