CREATE TABLE table_204_804 (id DECIMAL, "version" TEXT, "length" TEXT, "album" TEXT, "remixed by" TEXT, "year" DECIMAL, "comment" TEXT)

what was the shortest song ?
SELECT "version" FROM table_204_804 ORDER BY "length" LIMIT 1
SELECT "version" FROM "table_204_804" ORDER BY "length" NULLS FIRST LIMIT 1