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

what are the names of the ships ordered by ascending tonnage?
SELECT name FROM ship ORDER BY tonnage
SELECT "name" FROM "ship" ORDER BY "tonnage" NULLS FIRST