Calculate the percentage of sold blades in the total number of transactions.
percentage = MULTIPLY(DIVIDE(SUM(Quantity WHERE Name = 'Blade'), SUM(Quantity)), 1.0); 'blades' refers to name of product;
SELECT CAST(SUM(IIF(T1.Name = 'Blade', T2.Quantity, 0)) AS REAL) * 100 / SUM(T2.Quantity) FROM Products AS T1 INNER JOIN Sales AS T2 ON T1.ProductID = T2.ProductID