select date(zz) from
generate_series(date_trunc('month',to_date('20150305','yyyymmdd')),date_trunc('month',to_date('20150705','1 month') as tt(zz);
结果为：
select date(zz) from
generate_series(date_trunc('month',to_date('20150305','yyyymmdd')),date_trunc('month',to_date('20150705','1 month') as tt(zz);
结果为：
