What are the most popular confections product and calculate the total sales generated by this product?
most popular confections product refers to ProductID = max(count(MULTIPLY(Quantity, UnitPrice))) from CategoryName = 'Confections' ;  total sales refers to sum(MULTIPLY(Quantity, UnitPrice))
SELECT COUNT(T1.UnitPrice * T3.Quantity) FROM Products AS T1 INNER JOIN Categories AS T2 ON T1.CategoryID = T2.CategoryID INNER JOIN `Order Details` AS T3 ON T1.ProductID = T3.ProductID WHERE T2.CategoryName = 'Confections' GROUP BY T3.Quantity ORDER BY T3.Quantity DESC LIMIT 1