以前碰到的乙個表，儲存時間按照週為單位儲存，而卻需要按照天為單位使用。為了減少程式複雜度，便增加了多層查詢，提高sql查詢結果可用性。
select
(week_no-week_start)*7+week_day-week_day_start pp,
dateadd(day,(week_no-week_start)*7+week_day-week_day_start,month) the_day,
* from
(select
case datepart(w,month) when 7 then 1 else datepart(w,month)+1 end as week_day_start,
1 week_start,
* from
(select
[companyid]
,[employeeno]
,[year]
,[month]
,[week_no]
,[order_no]
,[sell_no]
,[workcode]
,1 as week_day
,[workhours_mon]
,[h_mon] as h
,[m_mon] as m
,[groupcode]
from
[cardtable]
union
select
[companyid]
,[employeeno]
,[year]
,[month]
,[week_no]
,[order_no]
,[sell_no]
,[workcode]
,2 as week_day
,[workhours_tue] as workhours
,[h_tue] as h
,[m_tue] as m
,[groupcode]
from
[cardtable]
union
select
[companyid]
,[employeeno]
,[year]
,[month]
,[week_no]
,[order_no]
,[sell_no]
,[workcode]
,3 as week_day
,[workhours_wed] as workhours
,[h_wed] as h
,[m_wed] as m
,[groupcode]
from
[cardtable]
union
select
[companyid]
,[employeeno]
,[year]
,[month]
,[week_no]
,[order_no]
,[sell_no]
,[workcode]
,4 as week_day
,[workhours_thu] as workhours
,[h_thu] as h
,[m_thu] as m
,[groupcode]
from
[cardtable]
union
select
[companyid]
,[employeeno]
,[year]
,[month]
,[week_no]
,[order_no]
,[sell_no]
,[workcode]
,5 as week_day
,[workhours_fri] as workhours
,[h_fri] as h
,[m_fri] as m
,[groupcode]
from
[cardtable]
union
select
[companyid]
,[employeeno]
,[year]
,[month]
,[week_no]
,[order_no]
,[sell_no]
,[workcode]
,6 as week_day
,[workhours_sat] as workhours
,[h_sat] as h
,[m_sat] as m
,[groupcode]
from
[cardtable]
union
select
[companyid]
,[employeeno]
,[year]
,[month]
,[week_no]
,[order_no]
,[sell_no]
,[workcode]
,7 as week_day
,[workhours_sun] as workhours
,[h_sun] as h
,[m_sun] as m
,[groupcode]
from
[cardtable]
) temp1
-- where
-- week_no=6
)temp2
--where not( week_no=week_start and week_dayorder by pp
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