4 курс 1 семестр / Курсовая / SQL / PR9

DELIMITER $$
CREATE PROCEDURE pr9(IN planeType VARCHAR(255))
BEGIN

SELECT planes.type, AVG(flights.time) as avg_duration
FROM flights
JOIN planes ON flights.plane_id = planes.plane_id
WHERE planes.type = planeType
GROUP BY planes.type;
IF (found_rows() = 0) THEN
SELECT 'Нет результатов для данного типа самолета' as 'Error';
END IF;
END $$
DELIMITER ;

CALL pr9('Ил-96-300');

drop procedure pr9;