Question: Great! Of those 8 customers, how many also have the status of "Shipped"?
SQL: select count ( * )  from  ( SELECT T1.customer_name FROM customers AS T1 JOIN orders AS T2 ON T1.customer_id  =  T2.customer_id WHERE T2.order_status  =  "On Road" INTERSECT SELECT T1.customer_name FROM customers AS T1 JOIN orders AS T2 ON T1.customer_id  =  T2.customer_id WHERE T2.order_status  =  "Shipped" )