Oracle日期与时间戳timestamp的转换

转换

select cast(to_date('2016/8/19','yyyy-mm-dd,hh24:mi:ss') as timestamp) date_to_timestamp from dual;  

select TO_CHAR(to_timestamp('2016/8/19','yyyy-mm-dd hh24:mi:ss') ,'YYYY-MM-DD HH24:MI:SS') from dual