SQL: Jahresanteile des Vertags berechnen?

[Furtbichler]

Ich glaube, es geht kürzer:

SQL-Code:

---
--- Testumgebung ----------------------------------------------------------
---
USE [Test]
GO

CREATE TABLE [dbo].[Contracts](
   [ctID] [int] IDENTITY(1,1) NOT NULL,
   [ctStart] [smalldatetime] NOT NULL,
   [ctDurationMonths] [int] NOT NULL,
   [ctPrice] [money] NOT NULL,
   [soll] [int] NULL
) ON [PRIMARY]


declare @startPeriod dateTime
declare @EndPeriod DateTime
set @startPeriod='20120101'
set @EndPeriod = '20121231'

--- Abfrage ---------------------------------------------------------------------------
select *, ctPrice*DateDiff(Month, dmin,dmax)/ctDurationMonths as PriceInPeriod
from
(
select *, 
   (select max (X) from (values (@StartPeriod), (ctStart)) as T(X)) dMin,
   (select min (X) from (values (@EndPeriod), (DateAdd(Month, ctDurationMonths, ctStart))) as T(X)) dMax
----------*****---- Hier war ein Tippfehler. Danke tgvoelker!   
 from contracts
 ) x
 where DateDiff(Month, dmin,dmax)>0
--------------------------------------------------------------------------------------