CREATE TABLE aircraft (aid DECIMAL, name TEXT, distance DECIMAL)
CREATE TABLE employee (eid DECIMAL, name TEXT, salary DECIMAL)
CREATE TABLE flight (flno DECIMAL, origin TEXT, destination TEXT, distance DECIMAL, departure_date TIME, arrival_date TIME, price DECIMAL, aid DECIMAL)
CREATE TABLE certificate (eid DECIMAL, aid DECIMAL)

What are the aircrafts with top 3 shortest lengthes? List their names.
SELECT name FROM aircraft ORDER BY distance LIMIT 3
SELECT "name" FROM "aircraft" ORDER BY "distance" NULLS FIRST LIMIT 3