CREATE TABLE mission (mission_id DECIMAL, ship_id DECIMAL, code TEXT, launched_year DECIMAL, location TEXT, speed_knots DECIMAL, fate TEXT)
CREATE TABLE ship (ship_id DECIMAL, name TEXT, type TEXT, nationality TEXT, tonnage DECIMAL)

List the name of ships in ascending order of tonnage.
SELECT name FROM ship ORDER BY tonnage
SELECT "name" FROM "ship" ORDER BY "tonnage" NULLS FIRST