oracle查出每一天

查出时间段内的每一天

select level,to_char(to_date('2013-01-01','yyyy-mm-dd')+level-1,'yyyy-mm-dd') as dat from dual

connect by level <=to_date('2013-01-18','yyyy-mm-dd')-to_date('2013-01-01','yyyy-mm-dd')+1

查出12个月

select decode('0'||level,'010','10','011','11','012','12','0'||level||'') as dat from dual connect by level <= 12