query: SELECT Studio FROM film EXCEPT SELECT Studio FROM film WHERE Director  =  "Walter Hill"
question: Which studios have never worked with no director Walter Hill?
query_toks: SELECT Studio FROM film EXCEPT SELECT Studio FROM film WHERE Director = `` Walter Hill ''
query_toks_no_value: select studio from film except select studio from film where director = value
question_toks: Which studios have never worked with no director Walter Hill?