如何在特定时间段内获得未保留的房间 [英] How Do I Get The Unreserved Rooms For A Particular Time Period

问题描述

hi.i我是sql server oracle的新手，我有一个问题：

我有2个桌子：tab房间

ID

RoomName标签预订

ID

DateStart

DateEnd

状态

评论ID_Rooms Basic我想在标签中找到房间清单的想法

房间，并在标签中预订房间

预订。 DateStart和DateEnd是

SmallDateTime类型。我的问题是使sql查询得到2

输入参数（DateStart和DateEnd），

并将返回所有未保留的房间
$ b DateStart和DateEnd之间的$ b。谢谢！

hi.i am novice with sql server oracle and I have a question:
I have 2 tables: tab Rooms
ID
RoomName tab Reservations
ID
DateStart
DateEnd
Status
Comment ID_Rooms Basic idea that I have a list of rooms in tab
Rooms, and reservations for that rooms in tab
Reservations. DateStart and DateEnd are
SmallDateTime type. My problem is to make sql query which will get 2
input parameters (DateStart and DateEnd),
and will return all rooms which are NOT reserved
in period between DateStart and DateEnd. Thanks!

推荐答案

最简单的方法是使用一个持有很长一段时间日期的临时辅助工具。例如，1-1-2000直到1-1-2050。然后，您可以轻松地从辅助表中选择所有日期，并将其与包含房间信息/预订的表格连接起来。还有一些关于这个主题的好书，比如Joe Celko的集合思维。



祝你好运！

Easiest way is using a temporal auxiliary that holds dates for a large period of time. For example, 1-1-2000 up until 1-1-2050. You can then easily select all dates from the auxiliary table and join it with the tables holding the room information/reservations. There are also some nice books on this subject like Joe Celko's thinking in sets.

Good luck!

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