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

What destination has the fewest number of flights?
SELECT destination FROM flight GROUP BY destination ORDER BY COUNT(*) LIMIT 1
SELECT "destination" FROM "flight" GROUP BY "destination" ORDER BY COUNT(*) NULLS FIRST LIMIT 1