Mysql查询获取酒店预订房间的未预订日期

Question

我有这样的桌子

Mst_Booking
    room_id int(11),
    order_id int(11),
    start datettime,
    end datetime

我可以获取此查询预订的具体日期

select * from Mst_Booking etc..,

结果

1   1   2017-01-01  2017-01-08
1   1   2017-01-11  2017-01-12

但是我无法获得像这样没有列出的数据

“未预订/可用日期”

room_id     start         end
1           2017-01-09    2017-01-10
1           2017-01-13    2017-01-31

请帮我创建更多表格以标记未预订吗？ 还是有根据我的要求检索数据的查询？

Answer 1

如果视图不打扰您，我们可以将每个room_id的“未预订”日期依次列出在另一个下方>>

您的桌子：

mysql> select * from mst_booking;

+---------+----------+---------------------+---------------------+
| room_id | order_id | start_date          | end_date            |
+---------+----------+---------------------+---------------------+
|       1 |        1 | 2017-01-01 00:00:00 | 2017-01-08 00:00:00 |
|       1 |        2 | 2017-01-11 00:00:00 | 2017-01-12 00:00:00 |
|       1 |        3 | 2017-01-17 00:00:00 | 2017-01-21 00:00:00 |
|       1 |        4 | 2017-01-25 00:00:00 | 2017-01-27 00:00:00 |
|       2 |        5 | 2017-01-17 00:00:00 | 2017-01-21 00:00:00 |
|       2 |        6 | 2017-01-25 00:00:00 | 2017-01-27 00:00:00 |
|       3 |        7 | 2017-01-16 00:00:00 | 2017-01-19 00:00:00 |
|       3 |        8 | 2017-01-25 00:00:00 | 2017-01-29 00:00:00 |    
+---------+----------+---------------------+---------------------+

列出“未预订”日期：

select room_id, adddate(end_date,1) as date from mst_booking where   
room_id=1 UNION select room_id,subdate(start_date,1) as date from 
mst_booking where start_date not in (select min(start_date) from 
mst_booking where room_id=1) and room_id=1 order by date;

结果：

+---------+---------------------+
| room_id | date                |
+---------+---------------------+
|       1 | 2017-01-09 00:00:00 |
|       1 | 2017-01-10 00:00:00 |
|       1 | 2017-01-13 00:00:00 |
|       1 | 2017-01-16 00:00:00 |
|       1 | 2017-01-22 00:00:00 |
|       1 | 2017-01-24 00:00:00 |
|       1 | 2017-01-28 00:00:00 |
+---------+---------------------+

您会看到“未预订/可用”的日期范围在其他日期的后面列出。

对于room_id = 2：

select room_id, adddate(end_date,1) as date from mst_booking where  
room_id=2 UNION select room_id,subdate(start_date,1) as date from  
mst_booking where start_date not in (select min(start_date) from 
mst_booking where room_id=2) and room_id=2 order by date;

结果：

+---------+---------------------+
| room_id | date                |
+---------+---------------------+
|       2 | 2017-01-22 00:00:00 |
|       2 | 2017-01-24 00:00:00 |
|       2 | 2017-01-28 00:00:00 |
+---------+---------------------+

对于room_id = 3：

select room_id, adddate(end_date,1) as date from mst_booking where     
room_id=3 UNION select room_id,subdate(start_date,1) as date from  
mst_booking where start_date not in (select min(start_date) from 
mst_booking where room_id=3) and room_id=3 order by date;

结果：

+---------+---------------------+
| room_id | date                |
+---------+---------------------+
|       3 | 2017-01-20 00:00:00 |
|       3 | 2017-01-24 00:00:00 |
|       3 | 2017-01-30 00:00:00 |
+---------+---------------------+