What are the total order quantities of photo products?
CREATE TABLE ORDER_ITEMS (Order_Quantity INTEGER, Product_ID VARCHAR); CREATE TABLE Products (Product_ID VARCHAR, Product_Name VARCHAR)
[SQL] SELECT SUM(T1.Order_Quantity) FROM ORDER_ITEMS AS T1 JOIN Products AS T2 ON T1.Product_ID = T2.Product_ID WHERE T2.Product_Name = "photo" [/SQL]