oracle獲取某個月所有的天數列表

select rownum from dual  
connect by rownum<=to_number(to_char(last_day(to_date('201902','yyyymm')),'dd'))

 

 

select to_date('200809','yyyymm')+(rownum-1) s_date from dual  
connect by rownum<=last_day(to_date('200809','yyyymm')) - to_date('200809','yyyymm') + 1