What is the difference in price between HL Mountain Frame - Black, 42 and LL Mountain Frame - Black, 42?
difference = SUBTRACT((Price WHERE Name = 'HL Mountain Frame - Black, 42'), (Price WHERE Name = 'HL Mountain Frame - Black, 42'));
SELECT ( SELECT Price FROM Products WHERE Name = 'HL Mountain Frame - Black, 42' ) - ( SELECT Price FROM Products WHERE Name = 'LL Mountain Frame - Black, 42' ) AS num
database name:db_id sales
Customers table Customers Cols: Customer ID dtype integer, First Name dtype text, Middle Initial dtype text, Last Name dtype text, 
Employees table Employees Cols: Employee ID dtype integer, First Name dtype text, Middle Initial dtype text, Last Name dtype text, 
Products table Products Cols: Product ID dtype integer, Name dtype text, Price dtype real, 
Sales table Sales Cols: Sales ID dtype integer, SalesPerson ID dtype integer, Customer ID dtype integer, Product ID dtype integer, Quantity dtype integer, 
