SELECT  CAST( 
(SELECT * FROM Orders JOIN [Order Details] AS Detail ON Orders.OrderID = Detail.OrderID  
WHERE Detail.OrderID IN (SELECT od.OrderID FROM [Order Details] AS od 
GROUP BY od.OrderID HAVING SUM(od.Quantity * od.UnitPrice) > 15000) 
FOR XML AUTO, ROOT('Orders') ) AS XML) AS Data INTO XMLOrders 

SELECT * FROM XMLOrders