我的查询显示heidisql错误，不知道如何解决

Question

SQL错误（1055）：SELECT列表的表达式＃2不在GROUP BY子句中，并且包含未聚合的列“ a.room id”，该列在功能上不依赖于GROUP BY子句中的列；这与sql_mode = only_full_group_by

不兼容

SELECT hotel_id,room_id,room_number,MAX(a.tc) AS "Count",MAX(tp) AS   "MostProfit" FROM
(SELECT hotel_id,rooms.room_id,room_number,COUNT(rooms.room_id) AS  "tc",SUM(room_price) AS "tp" FROM rooms JOIN bookings 
ON rooms.room_id = bookings.room_id
GROUP BY rooms.room_id) a GROUP BY hotel_id

trying to get the rooms of hotels that got the most profit in a query

Answer 1

该错误消息表示您需要将group by子句转换为

GROUP BY hotel_id, room_id, room_number

因为其他列tc和tp已汇总，因此无需包含在分组依据列表中，而room_id和room_number则没有。