选择城市价格最低的房间
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我有3张桌子的房间，酒店，城市，如何选择一个最低价的房间，每个城市的房价为
hotel_id
price | hotel_id | city_id
10 | 1 | 1
13 | 4 | 2
44 | 7 | 3
...
SELECT MIN(price) price, hotel_id, city_id FROM (
SELECT MIN(room_price1) price, hotel_id, city_id
FROM Hotel
JOIN Room USING(hotel_id)
JOIN City USING(city_id)
LEFT JOIN Service_hotel_option USING (hotel_id)
WHERE room_price1 > 0
GROUP BY hotel_id
ORDER BY price ASC) t
GROUP BY city_id
ORDER by city_name, price
没有找到相关结果
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1 个回复
疮痪徘弦漏
SELECT price, hotel_id, city_id FROM hotel INNER JOIN room AS r1 USING (hotel_id) WHERE NOT EXISTS (SELECT 1 FROM room AS r2 WHERE r2.hotel_id = r1.hotel_id AND r2.price < r1.price)中选择行。