CREATE TABLE table_204_487 (id DECIMAL, "home team" TEXT, "score" TEXT, "visiting team" TEXT, "location" TEXT, "venue" TEXT, "door" TEXT, "surface" TEXT)

what was the surface at most of the games ?
SELECT "surface" FROM table_204_487 GROUP BY "surface" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "surface" FROM "table_204_487" GROUP BY "surface" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1