CREATE FUNCTION [dbo].[ufnGetProductListPrice](@ProductID [int], @OrderDate [datetime])
RETURNS [money]
AS
BEGIN
DECLARE @ListPrice money;
SELECT @ListPrice = plph.[ListPrice]
FROM [Production].[Product] p
INNER JOIN [Production].[ProductListPriceHistory] plph
ON p.[ProductID] = plph.[ProductID]
AND p.[ProductID] = @ProductID
AND @OrderDate BETWEEN plph.[StartDate] AND COALESCE(plph.[EndDate], CONVERT(datetime, '99991231', 112)); -- Make sure we get all the prices!
RETURN @ListPrice;
END;
GO
EXECUTE sp_addextendedproperty @name = N'MS_Description', @value = N'Input parameter for the scalar function ufnGetProductListPrice. Enter a valid order date.', @level0type = N'SCHEMA', @level0name = N'dbo', @level1type = N'FUNCTION', @level1name = N'ufnGetProductListPrice', @level2type = N'PARAMETER', @level2name = N'@OrderDate';
GO
EXECUTE sp_addextendedproperty @name = N'MS_Description', @value = N'Input parameter for the scalar function ufnGetProductListPrice. Enter a valid ProductID from the Production.Product table.', @level0type = N'SCHEMA', @level0name = N'dbo', @level1type = N'FUNCTION', @level1name = N'ufnGetProductListPrice', @level2type = N'PARAMETER', @level2name = N'@ProductID';
GO
EXECUTE sp_addextendedproperty @name = N'MS_Description', @value = N'Scalar function returning the list price for a given product on a particular order date.', @level0type = N'SCHEMA', @level0name = N'dbo', @level1type = N'FUNCTION', @level1name = N'ufnGetProductListPrice';
GO
