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

Show the flight number of flights with three lowest distances.
SELECT flno FROM flight ORDER BY distance LIMIT 3
SELECT "flno" FROM "flight" ORDER BY "distance" FETCH FIRST 3 ROWS ONLY