What is the quantity of Ikura ordered in order no. 10273?
Ikura refers to ProductName = 'Ikura'; order no. refers to OrderID;
SELECT T2.Quantity FROM Products AS T1 INNER JOIN `Order Details` AS T2 ON T1.ProductID = T2.ProductID WHERE T2.OrderID = 10273 AND T1.ProductName = 'Ikura'