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-- Create index on LastName in Persons for faster search CREATE INDEX idx_lastname ON Persons (LastName); -- Query to retrieve the full name, city, total order amount, and number of orders for persons in Springfield SELECT p.FirstName, p.LastName, p.City, IFNULL(SUM(o.Amount), 0) AS TotalAmount, COUNT(o.OrderID) AS NumberOfOrders FROM Persons p LEFT JOIN Orders o ON p.PersonID = o.PersonID WHERE p.City = 'Springfield' GROUP BY p.PersonID ORDER BY TotalAmount DESC;

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