종종 TVF를 사용하여 동적 날짜/시간 범위를 만듭니다. 탤리/캘린더 테이블도 트릭을 수행 할 것이지만 UDF는 몇 가지 추가 기능을 제공합니다. 예를 들어,
Declare @YourTable table ([Type] varchar(25),StartDate date,EndDate date,Interval int)
Insert Into @YourTable values
('Test','2017-01-01','2019-01-01', 6)
Select A.[Type]
,B.*
From @YourTable A
Cross Apply [dbo].[udf-Range-Date](A.StartDate,A.EndDate,'MM', A.Interval) B
반환
Type RetSeq RetVal
Test 1 2017-01-01
Test 2 2017-07-01
Test 3 2018-01-01
Test 4 2018-07-01
Test 5 2019-01-01
UDF 레인지, DATEPART 및 증가를 제공 관심
CREATE FUNCTION [dbo].[udf-Range-Date] (@R1 datetime,@R2 datetime,@Part varchar(10),@Incr int)
Returns Table
Return (
with cte0(M) As (Select 1+Case @Part When 'YY' then DateDiff(YY,@R1,@R2)/@Incr When 'QQ' then DateDiff(QQ,@R1,@R2)/@Incr When 'MM' then DateDiff(MM,@R1,@R2)/@Incr When 'WK' then DateDiff(WK,@R1,@R2)/@Incr When 'DD' then DateDiff(DD,@R1,@R2)/@Incr When 'HH' then DateDiff(HH,@R1,@R2)/@Incr When 'MI' then DateDiff(MI,@R1,@R2)/@Incr When 'SS' then DateDiff(SS,@R1,@R2)/@Incr End),
cte1(N) As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
cte2(N) As (Select Top (Select M from cte0) Row_Number() over (Order By (Select NULL)) From cte1 a, cte1 b, cte1 c, cte1 d, cte1 e, cte1 f, cte1 g, cte1 h),
cte3(N,D) As (Select 0,@R1 Union All Select N,Case @Part When 'YY' then DateAdd(YY, N*@Incr, @R1) When 'QQ' then DateAdd(QQ, N*@Incr, @R1) When 'MM' then DateAdd(MM, N*@Incr, @R1) When 'WK' then DateAdd(WK, N*@Incr, @R1) When 'DD' then DateAdd(DD, N*@Incr, @R1) When 'HH' then DateAdd(HH, N*@Incr, @R1) When 'MI' then DateAdd(MI, N*@Incr, @R1) When 'SS' then DateAdd(SS, N*@Incr, @R1) End From cte2)
Select RetSeq = N+1
,RetVal = D
From cte3,cte0
Where D<[email protected]
)
/*
Max 100 million observations -- Date Parts YY QQ MM WK DD HH MI SS
Syntax:
Select * from [dbo].[udf-Range-Date]('2016-10-01','2020-10-01','YY',1)
Select * from [dbo].[udf-Range-Date]('2016-01-01','2017-01-01','MM',1)
*/
어떻게 날짜 범위 기능을 사용하려고하는 경우 ? 예제를 제공해 줄 수 있습니까? –