query: SELECT cust_name FROM customer EXCEPT SELECT cust_name FROM customer WHERE acc_type  =  'saving'
question: What the names of customers who does ain't saving accounts?
query_toks: SELECT cust_name FROM customer EXCEPT SELECT cust_name FROM customer WHERE acc_type = 'saving '
query_toks_no_value: select cust_name from customer except select cust_name from customer where acc_type = value
question_toks: What the names of customers who does ain't saving accounts?