CREATE TABLE table_203_249 (id DECIMAL, "position" DECIMAL, "song title" TEXT, "artist" TEXT, "sales" DECIMAL, "highest position" DECIMAL)

which artist has the least highest position ?
SELECT "artist" FROM table_203_249 ORDER BY "position" DESC LIMIT 1
SELECT "artist" FROM "table_203_249" ORDER BY "position" DESC NULLS LAST LIMIT 1