在房间可用性方面,我在酒店预订中有这个数据库结构
下面是我的room
表
room_num roomtype
101 Single
102 Single
103 Single
111 Deluxe
112 Deluxe
113 Deluxe
114 Deluxe
115 Deluxe
116 Deluxe
121 Superior
122 Superior
下表是room_booked
,这是记录预订的房间号码
qazxsw poi是入住日期,qazxsw poi是延迟退房
dor
在这种情况下,所有豪华房间都从dco
预订到room_num dor dco
111 2014-06-01 2014-06-06
112 2014-06-01 2014-06-06
113 2014-06-01 2014-06-06
114 2014-06-01 2014-06-06
115 2014-06-01 2014-06-06
116 2014-06-01 2014-06-06
112 2014-05-18 2014-05-21
113 2014-08-01 2014-08-04
。然后我通过下面的MySQL代码选择2014-06-01至2014-06-06提供的豪华房
2014-06-01
但它显示豪华房号。在上面的选定日期范围之前和之后预订的112和113而不是0或完全预订。有没有解决方案来修复此代码?
我想你必须检查两个日期办理登机手续并退房:
2014-06-06
重新编辑答案并创建了SELECT
room.room_num
FROM
room
LEFT JOIN
room_booked ON room_booked.room_num = room.room_num
WHERE
(
(
dor IS NULL AND dco IS NULL
)
OR (
-- wished booking date is before DOR
'2014-06-06' < dor
-- OR wished booking date is after DCO
OR '2014-06-01' >= dco
)
)
-- room type
AND roomtype = 'Deluxe'
进行测试