query: SELECT address FROM member EXCEPT SELECT address FROM member WHERE Membership_card  =  'Black'
question: Which address do not have no member with the black membership card?
query_toks: SELECT address FROM member EXCEPT SELECT address FROM member WHERE Membership_card = 'Black '
query_toks_no_value: select address from member except select address from member where membership_card = value
question_toks: Which address do not have no member with the black membership card?