Table: race_results_3
Columns: pos
manufacturer
seasons
starts
wins
sole_supplier
first_win
last_win
drivers
constr

Question: Name the number of constr with the first win at the 1978 brazilian grand prix
SQL: SELECT COUNT("constr") FROM race_results_3 WHERE "first_win" = '1978 Brazilian Grand Prix'

Question: What was the first win for pos 6?
SQL: SELECT "first_win" FROM race_results_3 WHERE "pos" = 6