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?
最佳答案
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
关于mysql - 房间预订查询,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16554649/