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)