CREATE TABLE table_203_620 (id DECIMAL, "tie no" DECIMAL, "home team" TEXT, "score" TEXT, "away team" TEXT, "attendance" DECIMAL)

what is the number of spectators in attendance in the hull city vs. oldham athletic game ?
SELECT "attendance" FROM table_203_620 WHERE "away team" = 'oldham athletic'
SELECT "attendance" FROM "table_203_620" WHERE "away team" = 'oldham athletic'