CREATE TABLE table_20944 ("Round" FLOAT, "Circuit" TEXT, "Date" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Winning Team" TEXT)

Who was the winning driver at Okayama International Circuit?
SELECT "Winning Driver" FROM table_20944 WHERE "Circuit" = 'Okayama International Circuit'
SELECT "Winning Driver" FROM "table_20944" WHERE "Circuit" = 'Okayama International Circuit'