CREATE TABLE table_203_189 (id DECIMAL, "year" DECIMAL, "competition" TEXT, "venue" TEXT, "position" TEXT, "notes" TEXT)

what was the longest distance traveled in the competitions ?
SELECT "notes" FROM table_203_189 ORDER BY "notes" DESC LIMIT 1
SELECT "notes" FROM "table_203_189" ORDER BY "notes" DESC NULLS LAST LIMIT 1