Silverlight：双向绑定综合应用-自动更新集合汇总字段

闲来无事，玩起Linux的cal命令，显示出某年某月的月历。尝试着用SQL语句写了一个类似的功能，有不完善的地方，请诸位大师指点！

查询某年某月的月历，输入字符串类型YYYYMM（比如'201102'表示2011年2月份）：

select max(decode(wk, 1, d)) Sun,
max(decode(wk, 2, d)) Mon,
max(decode(wk, 3, d)) Tue,
max(decode(wk, 4, d)) Wed,
max(decode(wk, 5, d)) Thu,
max(decode(wk, 6, d)) Fri,
max(decode(wk, 7, d)) Sat
from (select to_char(rownum, '00') d,
trunc((to_number(to_char(to_date('201109' || '01'), 'D')) + rownum - 2) / 7) p,
to_char(to_date('201109' || '01') + rownum - 1, 'D') wk
from dual
connect by rownum <= to_number(to_char(last_day(to_date('201109' || '01')),'DD'))) t
group by p
order by 7;

查询某年的年历，输入字符串类型YYYY（比如'2008'表示2008年）：

select decode(row_number() over(partition by m order by p, m, 7),
1, decode (m,
'01','Jan',
'02','Feb',
'03','Mar',
'04','Apr',
'05','May',
'06','Jun',
'07','Jul',
'08','Aug',
'09','Sep',
'10','Oct',
'11','Nov',
'12','Dec')) as Mon,
max(decode(wk, 1, d)) Sun,
max(decode(wk, 2, d)) Mon,
max(decode(wk, 3, d)) Tue,
max(decode(wk, 4, d)) Wed,
max(decode(wk, 5, d)) Thu,
max(decode(wk, 6, d)) Fri,
max(decode(wk, 7, d)) Sat
from (select d,m,wk,
trunc((p - 2 + row_number() over(partition by m order by d)) / 7) as p
from (select to_char(to_date('2008' || '01' || '01') + rownum - 1, 'DD') d,
to_char(to_date('2008' || '01' || '01') + rownum - 1, 'MM') m,
to_char(trunc(to_date('2008' || '01' || '01') + rownum - 1, 'MM'), 'D') p,
to_char(to_date('2008' || '01' || '01') + rownum - 1, 'D') wk
from dual
connect by to_date('2008' || '01' || '01') + rownum - 1 <
to_date('2008' || '01' || '01') + interval '1' year) a) b
group by m, p;

展示结果：









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