CREATE TABLE employee (eid DECIMAL, name TEXT, salary DECIMAL)
CREATE TABLE aircraft (aid DECIMAL, name TEXT, distance DECIMAL)
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)

Show flight number for all flights with more than 2000 distance.
SELECT flno FROM flight WHERE distance > 2000
SELECT "flno" FROM "flight" WHERE "distance" > 2000