Compute the total order quantity for Uncle Bob's Organic Dried Pears so far.
"Uncle Bob's Organic Dried Pears" is the ProductName; total order quantity refers to Sum(Quantity)
SELECT SUM(T2.Quantity) FROM Products AS T1 INNER JOIN `Order Details` AS T2 ON T1.ProductID = T2.ProductID WHERE T1.ProductName LIKE 'Uncle Bob%s Organic Dried Pears'