Identify the customer, which placed the largest order in terms of value.
value refers to SUM(UnitPrice * Quantity * SUBTRACT(1, Discount)); the largest order in value refers to MAX(value)
SELECT T1.CompanyName FROM Customers AS T1 INNER JOIN Orders AS T2 ON T1.CustomerID = T2.CustomerID INNER JOIN `Order Details` AS T3 ON T2.OrderID = T3.OrderID GROUP BY T2.CustomerID ORDER BY SUM(T3.UnitPrice * T3.Quantity * (1 - T3.Discount)) DESC LIMIT 1