CREATE TABLE table_203_255 (id DECIMAL, "no" DECIMAL, "test no" DECIMAL, "1st team" TEXT, "2nd team" TEXT, "winner" TEXT, "margin" TEXT, "toss" TEXT, "bat" TEXT, "date" TEXT)

what team had the most number of runs by margin ?
SELECT "winner" FROM table_203_255 ORDER BY "margin" DESC LIMIT 1
SELECT "winner" FROM "table_203_255" ORDER BY "margin" DESC NULLS LAST LIMIT 1