4 курс 1 семестр / Курсовая / SQL / PR8

DELIMITER $$
CREATE PROCEDURE pr7(IN start_date DATE, IN end_date DATE)
BEGIN
    SELECT airlines.name, SUM(tikets.cost) as total_revenue
    FROM tikets
    JOIN flights ON tikets.flight_id = flights.flight_id
    JOIN airlines ON flights.airline_code = airlines.airline_code
    WHERE tikets.sale_date BETWEEN start_date AND end_date
    GROUP BY airlines.name;
	IF (found_rows() = 0) THEN
    SELECT 'Не найдено данных для указанного диапазона дат' as 'Error';
    END IF;
END $$
DELIMITER ;

CALL pr7('2022-11-01', '2022-12-01');

DROP PROCEDURE pr7;