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mysql 分組後,在每個組中排序

如下資料:

活動id  批次id  批次開始時間  期望序號

1           1           09:00               1

1            2          09:01                2

1            3          09:05               3

2            4          08:55               1

2            5          09:00               2

.........

活動id :choose_room_activity_id

批次id: choose_room_batch_id

開始時間: start_date

表名:ztc_choose_room_batch

select a.choose_room_activity_id,a.choose_room_batch_id,count(*) as 序號,a.start_date from ztc_choose_room_batch as a
INNER JOIN ztc_choose_room_batch as b
ON a.choose_room_activity_id=b.choose_room_activity_id and a.start_date >= b.start_date group by a.choose_room_activity_id,a.choose_room_batch_id ORDER BY a.start_date asc;