CREATE FUNCTION [dbo].[ufnGetStock](@ProductID [int])
RETURNS [int]
AS
-- Returns the stock level for the product. This function is used internally only
BEGIN
DECLARE @ret int;
SELECT @ret = SUM(p.[Quantity])
FROM [Production].[ProductInventory] p
WHERE p.[ProductID] = @ProductID
AND p.[LocationID] = '6'; -- Only look at inventory in the misc storage
IF (@ret IS NULL)
SET @ret = 0
RETURN @ret
END;
GO
EXECUTE sp_addextendedproperty @name = N'MS_Description', @value = N'Input parameter for the scalar function ufnGetStock. Enter a valid ProductID from the Production.ProductInventory table.', @level0type = N'SCHEMA', @level0name = N'dbo', @level1type = N'FUNCTION', @level1name = N'ufnGetStock', @level2type = N'PARAMETER', @level2name = N'@ProductID';
GO
EXECUTE sp_addextendedproperty @name = N'MS_Description', @value = N'Scalar function returning the quantity of inventory in LocationID 6 (Miscellaneous Storage)for a specified ProductID.', @level0type = N'SCHEMA', @level0name = N'dbo', @level1type = N'FUNCTION', @level1name = N'ufnGetStock';
GO
