CREATE TABLE table_204_846 (id DECIMAL, "tie no" DECIMAL, "home team" TEXT, "score" TEXT, "away team" TEXT, "attendance" DECIMAL)

which tie no had the least attendants ?
SELECT "tie no" FROM table_204_846 ORDER BY "attendance" LIMIT 1
SELECT "tie no" FROM "table_204_846" ORDER BY "attendance" NULLS FIRST LIMIT 1