CREATE TABLE aircraft (aid NUMBER, name CLOB, distance NUMBER)
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 employee (eid NUMBER, name CLOB, salary NUMBER)

Show origin and destination for flights with price higher than 300.
SELECT origin, destination FROM flight WHERE price > 300
SELECT "origin", "destination" FROM "flight" WHERE "price" > 300