Who had the fastest lap when Al Unser won?
CREATE TABLE table_name_40 (fastest_lap VARCHAR, winning_driver VARCHAR)
SELECT fastest_lap FROM table_name_40 WHERE winning_driver = "al unser"
### Context: CREATE TABLE table_name_40 (fastest_lap VARCHAR, winning_driver VARCHAR) ### Question: Who had the fastest lap when Al Unser won? ### Answer: SELECT fastest_lap FROM table_name_40 WHERE winning_driver = "al unser"