CREATE TABLE table_32875 ("Name" TEXT, "Circuit" TEXT, "Date" TEXT, "Winning driver" TEXT, "Winning constructor" TEXT, "Report" TEXT)

Which winning driver of the Roussillon Grand Prix had an Alfa Romeo?
SELECT "Winning driver" FROM table_32875 WHERE "Winning constructor" = 'alfa romeo' AND "Name" = 'roussillon grand prix'
SELECT "Winning driver" FROM "table_32875" WHERE "Name" = 'roussillon grand prix' AND "Winning constructor" = 'alfa romeo'