CREATE TABLE table_204_449 (id DECIMAL, "no" DECIMAL, "episode" TEXT, "title" TEXT, "original airdate" TEXT, "viewers" DECIMAL, "nightly\ rank" DECIMAL)

what episode had the most viewers ?
SELECT "title" FROM table_204_449 ORDER BY "viewers" DESC LIMIT 1
SELECT "title" FROM "table_204_449" ORDER BY "viewers" DESC NULLS LAST LIMIT 1