Table schema:
CREATE TABLE Customer_Orders (Actual_Delivery_Date VARCHAR, Order_ID VARCHAR); CREATE TABLE ORDER_ITEMS (Order_ID VARCHAR, Order_Quantity VARCHAR)

Question: What are the actual delivery dates of orders with quantity 1?
SQL: SELECT T1.Actual_Delivery_Date FROM Customer_Orders AS T1 JOIN ORDER_ITEMS AS T2 ON T1.Order_ID = T2.Order_ID WHERE T2.Order_Quantity = 1