Database: regional_sales
Question: Please indicate total order quantity of product Candles and calculate the percentage of such product among all the orders.
SQL: SELECT SUM(CASE WHEN T1.`Product Name` = 'Candles' THEN T2.`Order Quantity` ELSE 0 END), CAST(SUM(CASE WHEN T1.`Product Name` = 'Candles' THEN T2.`Order Quantity` ELSE 0 END) AS REAL) * 100 / SUM(T2.`Order Quantity`) FROM Products AS T1 INNER JOIN `Sales Orders` AS T2 ON T2._ProductID = T1.ProductID INNER JOIN `Store Locations` AS T3 ON T3.StoreID = T2._StoreID