What are the different first names for customers from Brazil who have also had 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  =  "Brazil"
[{'FirstName': 'Luís'}, {'FirstName': 'Eduardo'}, {'FirstName': 'Alexandre'}, {'FirstName': 'Roberto'}, {'FirstName': 'Fernanda'}]