How much is the total purchase price, including freight, of the top 2 most expensive products?
total purchase price including freight refers to add(multiply(UnitPrice , Quantity) , Freight); most expensive refers to max(UnitPrice)
SELECT T2.UnitPrice * T2.Quantity + T1.Freight FROM Orders AS T1 INNER JOIN `Order Details` AS T2 ON T1.OrderID = T2.OrderID ORDER BY T2.UnitPrice * T2.Quantity + T1.Freight DESC LIMIT 2