我一直在学习 SQL 比平时稍微高级一点,我有点卡在这个上。
查询是从用户输入的出发地获取航空公司飞往(目的地)的所有机场。
SELECT DISTINCT a.airline_name, GROUP_CONCAT(ap.city) AS groupedDestinations
FROM routes AS r
LEFT JOIN airlines AS a
ON r.airline = a.airline_iata
LEFT JOIN airports AS ap
ON r.destination = ap.airport_iata
WHERE r.origin = ? AND a.active="Y" AND r.codeshare != "Y"
GROUP BY a.airline_name ASC
结果应该是:
Airline Name | city1, city2
相反,它是:
Airline Name | city1, city2, city1, city2
我花了几个小时才达到这一点,所以我将不胜感激任何建议、滥用或回答:)
谢谢你。