需要一個公式來找到年份和季度在SQL

Question

所以我有這個公式

GO 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 

-- This function takes a qtr (yyyyq), and adds the number of qtrs, and returns the future qtr 
--e.g. FutureQtr (20154,7) returns 20173 


CREATE FUNCTION [dbo].[FutureQtr_fn] (@StartQtr int,@AddlQtrs int) 

Returns int 

AS BEGIN 

RETURN 

     (@StartQtr/10*10)+ -- Current Year (yyyy) 

      ((@StartQtr%(@StartQtr/10*10) +@AddlQtrs - 1)/4)*10 -- add'l years (n0) 
      +(@StartQtr%(@StartQtr/10*10) +@AddlQtrs-1)%4 + 1 -- new qtr (n) 

END 
GO 

我想創建一個名爲dbo.GetPastQtr_fn新的公式，我希望它產生相同的結果。

但是不寫select dbo.FutureQtr_fn (20154,7) -> 20173 我想寫dbo.GetPastQtr_fn (20154,7)，這將給我20141。

因此它下降！

Answer 1

Select dbo.GetPastQtr_fn(20154,7) 

返回20141

CREATE FUNCTION [dbo].[GetPastQtr_fn] (@StartQtr int,@AddlQtrs int) 

Returns int 

AS 

BEGIN 
    Declare @Date Date=DateAdd(QQ,@AddlQtrs*-1,DateFromParts(@StartQtr/10,((@StartQtr-((@StartQtr/10)*10))*3),1)) 
    Return Year(@Date)*10+DatePart(QQ,@Date) 
End