mysql - 房间预订查询

Question

我在编写 sql 以从表中获取可用房间时遇到问题。

下面给出了我的表结构。

Table Booking
ID | START_DATE | END_DATE


Table BookingRoom (Intermediate Table)
ID   | BOOKING_ID   |ROOM_ID

一个房间可以链接到多个预订，一个预订可以包含多个房间

Table Room
Contains the ID room

我已经尝试过此操作，但如果一个房间链接到不同日期的 2 个不同预订，则将仅使用第一个预订 ID 进行比较

SELECT DISTINCT r.ID FROM room AS r ,booking AS b,bookingroom AS br
 WHERE r.ID = br.ID_ROOM
 AND b.ID = br.ID_BOOKING
 AND (
           b.END_DATE < '05/14/2013'
        OR b.START_DATE > '05/15/2013'
     )

有人可以帮我编写 SQL 来获取入住日期和退房日期之间的可用房间吗？

Answer 1

如果您想要的只是整个所需日期范围内的可用房间列表，那么类似以下内容可能会起作用:

Select Room.Id
From Room
Where Room.Id Not In    (
                        Select RoomId
                        From BookingRoom
                            Join Booking
                                On Booking.Id = BookingRoom.BookingId
                        Where Booking.StartDate <= 'DesiredEndDate'
                            And Booking.EndDate >= 'DesiredStartDate'
                        )
Order By Room.Id

因此，使用原始示例，我们可能会得到:

Select Room.Id
From Room
Where Room.Id Not In    (
                        Select RoomId
                        From BookingRoom
                            Join Booking
                                On Booking.Id = BookingRoom.BookingId
                        Where Booking.StartDate <= '2013-05-15'
                            And Booking.EndDate >= '2013-05-14'
                        )
Order By Room.Id