Database: customers_and_addresses
Question: Find the total amount of products ordered before 2018-03-17 07:13:53.
SQL: select sum(t2.order_quantity) from customer_orders as t1 join order_items as t2 on t1.order_id  =  t2.order_id where t1.order_date  <  "2018-03-17 07:13:53"