直接上代码：
SELECT to_date('20180101','yyyymmdd') + level-1 as everyDay from dual
connect by level <=
(last_day(to_date('20181201','yyyymmdd')) - to_date('20180101','yyyymmdd') +1);---这是日历
下面是对日历进行详细的操作
select to_char(everyDay,'yyyy-mm-dd') as dt,
to_char(everyday,'yyyy') as yr,
to_char(everyday,'mm') as mm,
to_char(everyday,'dd') as dd,
to_char(everyday,'dy') as dayofweek,
/*ORACLE自定义的标准周*/
to_char(everyday,'WW') as weeknum,
/*该月的第几周*/
/*lpad(to_char(everyday,'w'),6) as monthOfWeek,*/
to_char(everyday,'Q') as qr,
/*ISO的标准周，通常使用这个*/
to_char(everyday,'IW') as bourse_week,
null as id
from(select to_date('20180101','yyyymmdd') + level - 1 as everyDay from dual
connect by level <=
(last_day(to_date('20181201','yyyymmdd')) - to_date('20180101','yyyymmdd') +1));
注意：这个垃圾的文本编辑器，会出现字符修改，粘贴后需要进行编辑，才能进行正常使用
-- 生成日历
select to_char(veryday,'yyyy') year,
to_char(veryday,'mm') month,
to_char(veryday,'dd') day,
to_char(veryday-1,'d') week
from
(select (to_date('20170101','yyyymmdd') + level -1) veryday from dual
connect by level <=
(select last_day(to_date('20171231','yyyymmdd')) - to_date('20170101','yyyymmdd')+1 from dual ))