Show the names of customers who have both an order in completed status and an order in part status.
select t1.customer_name from customers as t1 join customer_orders as t2 on t1.customer_id = t2.customer_id where t2.order_status_code = 'Completed' intersect select t1.customer_name from customers as t1 join customer_orders as t2 on t1.customer_id = t2.customer_id where t2.order_status_code = 'Part'