Question: Give me the names of customers who have placed orders between 2009-01-01 and 2010-01-01.
SQL: SELECT T1.customer_name FROM customers AS T1 JOIN orders AS T2 ON T1.customer_id = T2.customer_id WHERE T2.date_order_placed >= "2009-01-01" AND T2.date_order_placed <= "2010-01-01"