CREATE TABLE [dbo].[StartFinish](
[DateStart] [datetime] NULL,
[DateFinish] [datetime] NULL
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[StartFinish] WITH CHECK
ADD CONSTRAINT [CK_StartFinish] CHECK ((datediff(day,[DateStart],[DateFinish])>(0)))
GO
ALTER TABLE [dbo].[StartFinish] CHECK CONSTRAINT [CK_StartFinish]
GO