oracle显示一个月的所有天数

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

select
to_date('200902','yyyymm')+(rownum-1) s_date
from all_tables
where rownum <=
(
select last_day(to_date('200902','yyyymm')) - to_date('200902','yyyymm')+1 from dual
)