query: SELECT LastName FROM CUSTOMER EXCEPT SELECT T1.LastName FROM CUSTOMER AS T1 JOIN Invoice AS T2 ON T1.CustomerId  =  T2.CustomerId WHERE T2.total  >  20
question: What-what a names last alla customer a invoice 20 exceeding totals?
query_toks: SELECT LastName FROM CUSTOMER EXCEPT SELECT T1.LastName FROM CUSTOMER AS T1 JOIN Invoice AS T2 ON T1.CustomerId = T2.CustomerId WHERE T2.total > 20
query_toks_no_value: select lastname from customer except select t1 . lastname from customer as t1 join invoice as t2 on t1 . customerid = t2 . customerid where t2 . total > value
question_toks: What-what a names last alla customer a invoice 20 exceeding totals?