Task: Text to Code
Input (English): Step 1: For each row in Customer table, find the corresponding rows in Invoice table.
Step 2: find without repetition FirstName of the results of step 1 whose BillingCountry equals Brazil
Output (English): SELECT DISTINCT T1.FirstName FROM Customer AS T1 JOIN Invoice AS T2 ON T1.CustomerId = T2.CustomerId WHERE T2.BillingCountry = "Brazil"