Task: Text to Code
Input (English): SQL: SELECT DISTINCT T1.FirstName FROM Customer AS T1 JOIN Invoice AS T2 ON T1.CustomerId = T2.CustomerId WHERE T2.BillingCountry = "Brazil"
Feedback: Replace billing address with track id and make sure whose customer ID present in invoice table .
Output (English): SELECT DISTINCT T1.FirstName FROM CUSTOMER AS T1 JOIN INVOICE AS T2 ON T1.CustomerId  =  T2.CustomerId WHERE T1.country  =  "Brazil"