query: SELECT customer_name FROM customers EXCEPT SELECT t1.customer_name FROM customers AS t1 JOIN customer_orders AS t2 ON t1.customer_id  =  t2.customer_id
question: Are Finding the names of customers never had placed no order.
query_toks: SELECT customer_name FROM customers EXCEPT SELECT t1.customer_name FROM customers AS t1 JOIN customer_orders AS t2 ON t1.customer_id = t2.customer_id
query_toks_no_value: select customer_name from customers except select t1 . customer_name from customers as t1 join customer_orders as t2 on t1 . customer_id = t2 . customer_id
question_toks: Are Finding the names of customers never had placed no order.