SELECT TOP 5 CustomerID, SUM(TotalAmount) AS TotalSpent FROM Orders WHERE OrderDate >= DATEADD(year, -1, GETDATE()) GROUP BY CustomerID ORDER BY TotalSpent DESC;

SELECT CustomerID, SUM(TotalAmount) AS TotalSpent FROM Orders WHERE OrderDate >= DATEADD(year, -1, GETDATE()) GROUP BY CustomerID ORDER BY TotalSpent DESC;

SELECT TOP 5 CustomerID, SUM(TotalAmount) AS TotalSpent FROM Orders GROUP BY CustomerID ORDER BY TotalSpent DESC;

SELECT CustomerID, SUM(TotalAmount) AS TotalSpent FROM Orders GROUP BY CustomerID ORDER BY TotalSpent DESC;