CREATE TABLE table_204_643 (id DECIMAL, "release" DECIMAL, "artist" TEXT, "title" TEXT, "notes" TEXT, "album" TEXT)

what has been the last song this artist has made an other appearance on ?
SELECT "title" FROM table_204_643 ORDER BY id DESC LIMIT 1
SELECT "title" FROM "table_204_643" ORDER BY "id" DESC NULLS LAST LIMIT 1