advanced_SQL/Q4.sql at main · milxss/advanced_SQL · GitHub

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SELECT LossGrouped.CustomerCategoryName,
       LossGrouped.MaxLoss,
       sub1.CustomerName,
       sub1.CustomerID
FROM
	   (SELECT Cu.CustomerID,
               Cu.CustomerName,
               Ca.CustomerCategoryName,
               Sum(ol.quantity * ol.unitprice) AS TotalValueLostOrders
		 FROM   sales.orders AS O,
               sales.orderlines AS ol,
               sales.customers AS Cu,
               sales.customercategories AS Ca
		  WHERE  NOT EXISTS
		  (SELECT * FROM
				sales.invoices AS Iv
           WHERE  Iv.orderid = O.orderid)
				AND ol.orderid = O.orderid
                AND Cu.CustomerID = O.CustomerID
                AND Ca.customercategoryid = Cu.customercategoryid
			GROUP  BY Cu.CustomerID, Cu.CustomerName, Ca.CustomerCategoryName)
AS sub1
JOIN
		(SELECT Loss.CustomerCategoryName,
               Max(Loss.totalvaluelostorders) AS MaxLoss
         FROM
		(SELECT Cu.CustomerID,
                Cu.CustomerName,
                Ca.CustomerCategoryName,
                Sum(ol.Quantity * ol.UnitPrice) AS TotalValueLostOrders
		FROM   Sales.Orders AS O,
               Sales.OrderLines AS OL,
               Sales.Customers AS Cu,
			   Sales.CustomerCategories AS Ca
        WHERE  NOT EXISTS
				(SELECT Iv.OrderID
				 FROM Sales.Invoices AS Iv
                  WHERE  Iv.orderid = O.orderid)
                  AND OL.OrderID = O.OrderID
                  AND Cu.CustomerID = O.CustomerID
                  AND Ca.customercategoryid = Cu.customercategoryid
          GROUP  BY Cu.CustomerID, Cu.CustomerName, Ca.CustomerCategoryName)
AS Loss
        GROUP  BY CustomerCategoryName)
AS LossGrouped
ON  sub1.CustomerCategoryName = LossGrouped.CustomerCategoryName
       AND sub1.totalvaluelostorders = LossGrouped.MaxLoss
ORDER  BY LossGrouped.MaxLoss DESC