What is the ID of the oldest customer?
select customer_id from orders order by date_order_placed limit 1
what about the newest customer?
select customer_id from orders order by date_order_placed desc limit 1
What is the order status of the order for customer with ID 11
select order_status from orders where customer_id = 11
What date did customer with ID 11 place an order?
select date_order_placed from orders where customer_id = 11