CREATE TABLE table_203_478 (id DECIMAL, "week" DECIMAL, "date" TEXT, "opponent" TEXT, "result" TEXT, "attendance" DECIMAL)

against which opponent were there the most people in attendance ?
SELECT "opponent" FROM table_203_478 ORDER BY "attendance" DESC LIMIT 1
SELECT "opponent" FROM "table_203_478" ORDER BY "attendance" DESC NULLS LAST LIMIT 1