SELECT DISTINCT T1.FirstName FROM CUSTOMER AS T1 JOIN INVOICE AS T2 ON T1.CustomerId  =  T2.CustomerId WHERE T1.country  =  "Brazil"
Find the first names of all customers that live in Brazil and have an invoice.
SELECT DISTINCT T1.FirstName FROM CUSTOMER AS T1 JOIN INVOICE AS T2 ON T1.CustomerId = T2.CustomerId WHERE T1.country = `` Brazil ''
select distinct t1 . firstname from customer as t1 join invoice as t2 on t1 . customerid = t2 . customerid where t1 . country = value
Find the first names of all customers that live in Brazil and have an invoice .