T-SQL 產生一個簡易的 西曆年曆 T-SQL 含日期所在月及年的周次

--增加了日期所在月及年的周次!
--星期日要算在"上一周"!(注意 WeekOfYear、WeekOfMonth 與 MyWeekOfYear、MyWeekOfMonth 的區別)
--注意 datename 的值會因 SQL Server 語言版本或日期格式有所差異!
--本測試環境為: SQL Server 2000 簡體中文版 + Windows 簡體中文版

declare @ datetime
set @ = '1995-02-25 11:00:50' -- 1995-01-01 正好是個星期日

select @ as 日期
      ,dateadd(year,datediff(year,0,@),0) as 所在年的第一天
      ,dateadd(year,1+datediff(year,0,@),0)-1 as 所在年的最後一天
      ,dateadd(quarter,datediff(quarter,0,@),0) as 所在季的第一天
      ,dateadd(quarter,1+datediff(quarter,0,@),0)-1 as 所在季的最後一天
      ,dateadd(month,datediff(month,0,@),0) as 所在月的第一天
      ,dateadd(month,1+datediff(month,0,@),0)-1 as 所在月的最後一天
      ,dateadd(week,datediff(week,0,@),0) as 所在周的第一天
      ,dateadd(week,1+datediff(week,0,@),0)-1 as 所在周的最後一天

select
 dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0))))) as [Date]
,datename(weekday,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))) as [WeekDayName]
,datepart(weekday,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))) as [WeekDay]
,(@@datefirst + datepart(weekday,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0))))))) % 7 as [MyWeekDay]

,datepart(week,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))) as WeekOfYear
,datediff(week
                 ,case when (@@datefirst + datepart(weekday,dateadd(day,0,datediff(day,0,dateadd(year,datediff(year,0,@),0))))) % 7 = 1
                            then dateadd(day,-1,dateadd(day,0,datediff(day,0,dateadd(year,datediff(year,0,@),0))))
                       else dateadd(day,0,datediff(day,0,dateadd(year,datediff(year,0,@),0))) --date 所在年的第一天 即: 一月一號
                  end
                 ,case when (@@datefirst + datepart(weekday,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0))))))) % 7 = 1
                            then dateadd(day,-1,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0))))))
                       else dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))
                  end
                ) + 1 as MyWeekOfYear

,datediff(week,dateadd(day,1-day(dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))),dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))),dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))) +1 as WeekOfMonth

,datediff(week
                 ,case when (@@datefirst + datepart(weekday,dateadd(month,datediff(month,0,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))),0))) % 7 = 1
                            then dateadd(month,datediff(month,0,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))),0) -1
                       else dateadd(month,datediff(month,0,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))),0)
                  end
                 ,case when (@@datefirst + datepart(weekday,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0))))))) % 7 = 1
                            then dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))-1
                       else dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))
                  end
                ) + 1 as MyWeekOfMonth

,datepart(dayofyear,dateadd(day,0,datediff(day,0,dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))))) as DayOfYear

from
(
select 0 as i
union all select 1 union all select 2 union all select 3
union all select 4 union all select 5 union all select 6
union all select 7 union all select 8 union all select 9
union all select 10 union all select 11
) M
,
(
select 0 as i
union all select 1 union all select 2 union all select 3 union all select 4 union all select 5
union all select 6 union all select 7 union all select 8 union all select 9 union all select 10
union all select 11 union all select 12 union all select 13 union all select 14
union all select 15 union all select 16 union all select 17 union all select 18
union all select 19 union all select 20 union all select 21 union all select 22
union all select 23 union all select 24 union all select 25 union all select 26
union all select 27 union all select 28 union all select 29 union all select 30
) d

where datediff(month,dateadd(year,datediff(year,0,@),0),dateadd(day,d.i,dateadd(month,m.i,dateadd(year,datediff(year,0,@),0)))) = m.i
order by [Date]