query: SELECT product_name FROM Products EXCEPT SELECT T1.product_name FROM Products AS T1 JOIN Order_items AS T2 ON T1.product_id  =  T2.product_id
question: Show all product names without an order.
query_toks: SELECT product_name FROM Products EXCEPT SELECT T1.product_name FROM Products AS T1 JOIN Order_items AS T2 ON T1.product_id = T2.product_id
query_toks_no_value: select product_name from products except select t1 . product_name from products as t1 join order_items as t2 on t1 . product_id = t2 . product_id
question_toks: Show all product names without an order.