IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[foo_IdGetDAS]') AND type in (N'FN', N'IF', N'TF', N'FS', N'FT'))
DROP FUNCTION [dbo].[foo_IdGetDAS]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[foo_IdGetDAS]') AND type in (N'FN', N'IF', N'TF', N'FS', N'FT'))
BEGIN
execute dbo.sp_executesql @statement = N'CREATE FUNCTION [dbo].[foo_IdGetDAS]
(
	@HardwareId varchar(50)
)
RETURNS int
AS
BEGIN
		RETURN (case 
				when @HardwareId is null then 0
				when  charindex(''_'', @HardwareId) = 0 then  isnull((select top 1 d.DASId from [dbo].[DAS] d where d.SerialNumber= @HardwareId), 0)
				else  isnull((select top 1 d.DASId from [dbo].[DAS] d where d.SerialNumber= left(@HardwareId, charindex(''_'', @HardwareId)-1)), 0) 
				end)
END


' 
END

GO