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task1=SELECT COUNT(*) AS total_boarding_passes FROM boarding_passes;
task2=SELECT COUNT(DISTINCT ticket_no) AS unique_passengers_count FROM boarding_passes WHERE seat_no = '17E';
task3=SELECT MAX(amount) AS most_expensive_ticket, MIN(amount) AS cheapest_ticket, AVG(amount) AS average_ticket_price FROM ticket_flights;
task4=SELECT passenger_name FROM tickets WHERE passenger_id LIKE '8099%43' AND book_ref LIKE 'B%';
task5=SELECT COUNT(*) AS flights_count FROM flights WHERE aircraft_code IN (SELECT aircraft_code FROM aircrafts_data WHERE model LIKE '%Cessna 208 Caravan%');
task6=SELECT ad.airport_name, ad.city, f.flight_id, f.flight_no FROM flights f JOIN airports_data ad ON f.departure_airport = ad.airport_code WHERE f.flight_no = 'PG0305' AND f.scheduled_departure = '2017-09-09 09:10:00+04';
task7=SELECT a.model FROM flights f JOIN aircrafts_data a ON f.aircraft_code = a.aircraft_code WHERE f.flight_no = 'PG0210' LIMIT 1;
task8=SELECT passenger_name AS FI FROM tickets WHERE passenger_name ILIKE '% anna %' OR passenger_name ILIKE 'anna %' OR passenger_name ILIKE '% anna' UNION SELECT CONCAT(first_name, ' ', last_name) AS FI FROM employees WHERE first_name ILIKE '%anna%' OR last_name ILIKE '%anna%';