oracle日历
select max(decode(to_char(dt, 'day'), '星期日', to_char(dt, 'dd'))) "星期日", max(decode(to_char(dt, 'day'), '星期一', to_char(dt, 'dd'))) "星期一", max(decode(to_char(dt, 'day'), '星期二', to_char(dt, 'dd'))) "星期二", max(decode(to_char(dt, 'day'), '星期三', to_char(dt, 'dd'))) "星期三", max(decode(to_char(dt, 'day'), '星期四', to_char(dt, 'dd'))) "星期四", max(decode(to_char(dt, 'day'), '星期五', to_char(dt, 'dd'))) "星期五", max(decode(to_char(dt, 'day'), '星期六', to_char(dt, 'dd'))) "星期六" from (select to_char(dt, 'd') - row_number() over(order by dt) gcol, dt from (select trunc(to_date('2010-12-18', 'yyyy-mm-dd'), 'mm') + level - 1 dt from dual connect by level <= to_char(last_day(to_date('2010-12-18', 'yyyy-mm-dd')), 'dd'))) group by gcol order by abs(gcol)?