Consulta para calcular ventas por mes(Comparativo)

[juantiva]

Primero creas una funcion:

Código SQL:

IF OBJECT_ID (N'dbo.ProductResultByMonth', N'FN') IS NOT NULL
    DROP FUNCTION dbo.ProductResultByMonth;
GO
CREATE FUNCTION dbo.ProductResultByMonth(@ProductId INT, @YEAR INT, @MONTH INT)
RETURNS DECIMAL
WITH EXECUTE AS CALLER
AS
BEGIN
     DECLARE @RESULT DECIMAL;
 
SELECT 
    @RESULT = SUM([ORDER Details].UnitPrice * [ORDER Details].Quantity)
FROM 
    Products 
INNER JOIN
    [ORDER Details] 
ON 
    [ORDER Details].ProductID = Products.ProductID 
INNER JOIN
    Orders 
ON 
    [ORDER Details].OrderID = Orders.OrderID
WHERE 
    Products.ProductID = @ProductId AND
    YEAR(Orders.OrderDate) = @YEAR AND 
    MONTH(Orders.OrderDate) = @MONTH
 
     RETURN(ISNULL(@RESULT,0));
END;
GO
 

Luego para lograr el formato que requieres utilizas la funcion:

Código SQL:

DECLARE @YEAR INT
SET @YEAR = 1997
 
SELECT 
ProductName, 
dbo.ProductResultByMonth(ProductID, @YEAR, 1) Enero, 
dbo.ProductResultByMonth(ProductID, @YEAR, 2) Febrero, 
dbo.ProductResultByMonth(ProductID, @YEAR, 3) Marzo,
dbo.ProductResultByMonth(ProductID, @YEAR, 4) Abril, 
dbo.ProductResultByMonth(ProductID, @YEAR, 5) Mayo, 
dbo.ProductResultByMonth(ProductID, @YEAR, 6) Junio,
dbo.ProductResultByMonth(ProductID, @YEAR, 7) Julio, 
dbo.ProductResultByMonth(ProductID, @YEAR, 8) Agosto, 
dbo.ProductResultByMonth(ProductID, @YEAR, 9) Septiembre,
dbo.ProductResultByMonth(ProductID, @YEAR, 10) Octubre, 
dbo.ProductResultByMonth(ProductID, @YEAR, 11) Noviembre, 
dbo.ProductResultByMonth(ProductID, @YEAR, 12) Diciembre
FROM
    Products (nolock)
 

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