SQL Assessment: Airports with one-way departures

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Task 28:

Find airports from which you can fly in only one direction.
Create the resulting table with columns: departure_airport, departure_city - name and city of departure airport (in English), arrival_airport and arrival_city name and city of the destination airport (in English). Sort the result by the departure_city column.

Use PostgreSQL syntax to write your answer. Descriptions of tables are provided in the right pane.

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Bookings Database (PostgreSQL)

The subject area of this database is airline flights through various airports.

ER diagram of the Bookings database

The Bookings Database contains 8 tables:

aircrafts_data - table of aircrafts.

aircraft_codeUnique code for each aircraft.
modelAircraft model name in English and Russian in JSON format.
rangeAircraft fly range in kilometers.

PRIMARY KEY, btree (aircraft_code)

	aircraft_code	model	range
1	773	{"en": "Boeing 777-300", "ru": "Боинг 777-300"}	11100

airports_data - table of airports.

airport_codeUnique code for each airport.
airport_nameAirport name in English and Russian in JSON format.
cityAirport city in English and Russian in JSON format.
coordinatesAirport coordinates as POINT(longitude, latitude).
timezoneAirport timezone name.

PRIMARY KEY, btree (airport_code)

	airport_code	airport_name	city	coordinates	timezone
1	YKS	{"en": "Yakutsk Airport", "ru": "Якутск"}	{"en": "Yakutsk", "ru": "Якутск"}	(129.77099609375,62.0932998657227)	Asia/Yakutsk

boarding_passes - table of boarding passes.

ticket_noTicket number.
flight_idFlight identificator.
boarding_noBoarding pass number.
seat_noSeat number.

PRIMARY KEY, btree (ticket_no, flight_id)
UNIQUE CONSTRAINT, btree (flight_id, boarding_no)
UNIQUE CONSTRAINT, btree (flight_id, seat_no)

FOREIGN KEY (ticket_no, flight_id) REFERENCES ticket_flights(ticket_no, flight_id)

	ticket_no	flight_id	boarding_no	seat_no
1	0005435212351	30625	1	2D

bookings - table of bookings.

book_refBooking number.
book_dateBooking date.
total_amountTotal booking cost.

PRIMARY KEY, btree (book_ref)

	book_ref	book_date	total_amount
1	00000F	2017-07-05 00:12:00+00	265700.00

flights - table of flights.

flight_idFlight ID.
flight_noFlight number.
scheduled_departureScheduled departure time.
scheduled_arrivalScheduled arrival time.
departure_airportAirport of departure.
arrival_airportAirport of arrival.
statusFlight status.
aircraft_codeAircraft code, IATA.
actual_departureActual departure time.
actual_arrivalActual arrival time.

PRIMARY KEY, btree (flight_id)
UNIQUE CONSTRAINT, btree (flight_no, scheduled_departure)

	flight_id	flight_no	scheduled_departure	scheduled_arrival	departure_airport	arrival_airport	status	aircraft_code	actual_departure	actual_arrival
1	1185	PG0134	2017-09-10 06:50:00+00	2017-09-10 11:55:00+00	DME	BTK	Scheduled	319

seats - table of aircraft seats.

aircraft_codeAircraft code, IATA.
seat_noSeat number.
fare_conditionsTravel class.

PRIMARY KEY, btree (aircraft_code, seat_no)

FOREIGN KEY (aircraft_code) REFERENCES aircrafts(aircraft_code) ON DELETE CASCADE

	aircraft_code	seat_no	fare_conditions
1	319	2A	Business

ticket_flights - ticket to flights relations.

ticket_noTicket number.
flight_idFlight ID.
fare_conditionsTravel class.
amountTravel cost.

PRIMARY KEY, btree (ticket_no, flight_id)

FOREIGN KEY (flight_id) REFERENCES flights(flight_id)
FOREIGN KEY (ticket_no) REFERENCES tickets(ticket_no)

	ticket_no	flight_id	fare_conditions	amount
1	0005432159776	30625	Business	42100.00

tickets - table of tickets.

ticket_noTicket number.
book_refBooking number.
passenger_idPassenger ID.
passenger_namePassenger name.
contact_dataPassenger contact information.

	ticket_no	book_ref	passenger_id	passenger_name	contact_data
1	0005432000987	06B046	8149 604011	VALERIY TIKHONOV	{"phone": "+70127117011"}

PRIMARY KEY, btree (ticket_no)

FOREIGN KEY (book_ref) REFERENCES bookings(book_ref)