我需要按FY分割这些日期，并获取日期之间的月数。我之前在How to duplicate Rows with new entries链接处回答了FY分组。 有以下日期： -
ID Start dt End dt
2550 10/1/2010 9/30/2011
2551 8/1/2014 7/31/2015
2552 6/1/2013 5/31/2015
2553 5/10/2012 6/11/2014
我想要以下结果集：
ID FY # of Months Start Dt End Dt
2550 2011 12 10/1/2010 9/30/2011
2551 2014 2 8/1/2014 9/30/2014
2551 2015 10 10/1/2014 7/31/2015
2552 2013 4 6/1/2013 9/30/2013
2552 2014 12 10/1/2013 9/30/2014
2552 2015 8 10/1/2014 5/31/2015
2553 2012 5 5/10/2012 9/30/2012
2553 2013 12 10/1/2012 9/30/2013
2553 2014 9 10/1/2013 6/11/2014
FY将被视为明年10月至9月。
提前致谢！
答案 0 :(得分：0)
构建这是一个有趣的查询：
declare @t table(id int, start_dt datetime, end_dt datetime)
Insert into @t(id, start_dt, end_dt) Values
(2550, '2010/10/1', '2011/9/30')
, (2551, '2014/8/1', '2015/7/31')
, (2552, '2013/6/1', '2015/5/31')
, (2553, '2012/5/10', '2014/6/11')
, (2554, '2012/5/10', '2012/11/1')
, (2555, '2012/5/10', '2012/8/11')
; with data as(
Select id, start_dt, end_dt, next_y = DATEADD(month, 9, DATEADD(year, DATEDIFF(year, 0, DATEADD(month, 3, start_dt)), 0))
From @t
), split as (
Select id, start_dt
, end_dt = case when next_y > end_dt then end_dt else DATEADD(day, -1, next_y) end
, next_y = DATEADD(year, 1, next_y)
From data as d
Union All
Select s.id
, DATEADD(day, 1, s.end_dt)
, case when DATEADD(day, -1, next_y) < t.end_dt then DATEADD(day, -1, next_y) else t.end_dt end
, next_y = DATEADD(year, 1, s.next_y)
From split as s
Inner Join @t as t on t.id = s.id
Where s.end_dt < t.end_dt
)
Select ID, FY = year(end_dt), '# of Months' = DATEDIFF(month, start_dt, end_dt)+1, 'Start Dt' = start_dt, 'End Dt' = end_dt
From split
Order by id, start_dt, end_dt