select week,
min((case when weekday='1' then day else null end)) "星期日",
min((case when weekday='2' then day else null end)) "星期一",
min((case when weekday='3' then day else null end)) "星期二",
min((case when weekday='4' then day else null end)) "星期三",
min((case when weekday='5' then day else null end)) "星期四",
min((case when weekday='6' then day else null end)) "星期五",
min((case when weekday='7' then day else null end)) "星期六"
from (select day,
decode(sign(rn-weekday),-1,week,week+1) week,weekday
from (select to_date(day,'yyyy-mm-dd') day,
to_char(to_date(day,'yyyy-mm-dd'),'d') weekday,
to_char(to_date(day,'yyyy-mm-dd'),'w') week,
row_number() over(partition by to_char(to_date(day,'yyyy-mm-dd'),'w')order by day) rn
from (select to_char(add_months(last_day(sysdate), -1)+1,'yyyymmdd') + level -1 day
from dual
connect by level<= to_char(last_day(sysdate),'yyyymmdd')-to_char(add_months(last_day(sysdate), -1)+1,'yyyymmdd')+1
) ) )
group by week
order by week;
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