Consider the following simplified relational schema for an airline ticket reservation system. Airline Reservation Schema customer (customer_id, first_name, last_name, customer_email, customer_address, city, customer_phone) airline (airline_code, airline_name, airline_country) city( city_id, city_name, post_code, country, province) flight ( flight_no, airline_code, origin_city, destination_city) flight_schedule (schedule_id, flight_no, departure_date, departure_time, arrival_date, arrival_time) booking ( booking _number, customer_id, schedule_id, booking_class, booking_status) • The customer table contains information about customers and customer_id is the primary key. The field city is a foreign key and refers to the city relation. • The airline table contains information about airlines and airline_code is the primary key. • The city table contains information about cities and city_id is the primary key. Also, the post_code is unique for each city. • The flight table contains information about flights and flight_no is the primary key. The fields airline_code, origin_city, and destination_city are foreign keys and refer to airline, city, and city relations respectively. • The flight_schedule table contains information about scheduled trips for the flight and schedule_id is the primary key. The field flight_no is a foreign key and refers to the flight relation. • The booking table contains information about bookings and booking_number is the primary key. A booking will be for a customer for a given flight schedule. The fields customer_id and schedule_id are foreign keys and refer to the customer and flight_schedule relations respectively. Write a SQL expression to list the first name and last name of customers who have more than 5 bookings this year.

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Transaction Processing

Transaction processing is a computational style generally performed by server computers, which supports interactive applications (apps). Transaction processing is also known as information processing, which divides the work into indivisible and individual operations called transactions. The transaction is a set of tasks; a single task is considered as the minimum processing unit that cannot be divided again.