What is the profit of a single product that received the highest rating from John Smith? List the product/s' names.
highest rating refers to Rating = 5; profit = SUBTRACT(ListPrice, StandardCost);
SELECT T1.ListPrice - T1.StandardCost, T1.Name FROM Product AS T1 INNER JOIN ProductReview AS T2 ON T1.ProductID = T2.ProductID WHERE T2.ReviewerName = 'John Smith' ORDER BY T2.Rating DESC LIMIT 1