branch(branch_name,branch_city,assets)
account(acc_number,branch_name,balance)
depositor(customer_name,acc_number)



select distinct S.customer_name
from depositor as S
where not exist((select branch_name
from branch
where branch_city='Brooklyn')
wxcept
(select R.branch_name
from deporistor as T,account as R
where T.account_number = R.account_number and S.customer_name=T.customer_name))