-- Database schema
| Customers : CustomerID [ INTEGER ] primary_key , FirstName [ TEXT ] , MiddleInitial [ TEXT ] , LastName [ TEXT ] | Employees : EmployeeID [ INTEGER ] primary_key , FirstName [ TEXT ] , MiddleInitial [ TEXT ] , LastName [ TEXT ] | Products : ProductID [ INTEGER ] primary_key , Name [ TEXT ] , Price [ REAL ] | Sales : SalesID [ INTEGER ] primary_key , SalesPersonID [ INTEGER ] Sales.SalesPersonID = Employees.EmployeeID , CustomerID [ INTEGER ] Sales.CustomerID = Customers.CustomerID , ProductID [ INTEGER ] Sales.ProductID = Products.ProductID , Quantity [ INTEGER ] |
-- -- Among the "Mountain-500 Black" product types, which type was purchased the most?

SELECT T1.Name FROM Products AS T1 INNER JOIN Sales AS T2 ON T1.ProductID = T2.ProductID WHERE T1.Name LIKE 'Mountain-500 Black%' GROUP BY T2.Quantity, T1.Name ORDER BY SUM(T2.Quantity) DESC LIMIT 1;