what is the order status code of Sterling
SELECT T2.order_status_code FROM customers AS T1 JOIN customer_orders AS T2 ON T1.customer_id   =   T2.customer_id WHERE T1.customer_name = "Sterling"
order status code of a customer refers to order_status_code; the relationship between customers and their orders is represented by JOIN on customer_id; customer's name is used to filter the records.