如何在SQL Server中的两个表中循环获取日期范围

Question

Please, can anyone give me any idea how to get all dates individually within a date range of another table.

How to do 'not include 18 and 19' also: How do I rewrite stored procedure not to count as available middle dates(18,19) of Reservation table status 'Occupied'.

I have date range in Reservation table of :

CheckInDate (07/16/2014 12:00:00 AM)
CheckOutDate (07/20/2014 13:00:00 PM)

RoomNumber     CheckInDate                CheckOutDate               Status
   204         07/16/2014 12:00:00 AM     07/20/2014 13:00:00 PM     Occupied  

But in my AvailableTest table, there is no date range. All records are going individual date. But in Reservation table they do not have individual date. They have range and how do I match that date range and my individual date from AvailableTest table.

RoomNumber     CheckInDate                CheckOutDate               Status
   204         07/16/2014 12:00:00 AM     07/16/2014 13:00:00 PM     Available
   204         07/17/2014 12:00:00 AM     07/17/2014 13:00:00 PM     Available
   204         07/18/2014 12:00:00 AM     07/18/2014 13:00:00 PM     Available
   204         07/19/2014 12:00:00 AM     07/19/2014 13:00:00 PM     Available
   204         07/20/2014 12:00:00 AM     07/20/2014 13:00:00 PM     Available

If someone check for available room within range of 07/18/2014 to 07/24/2014

   204         07/18/2014 12:00:00 AM     07/18/2014 13:00:00 PM     Available
   204         07/19/2014 12:00:00 AM     07/19/2014 13:00:00 PM     Available
   204         07/20/2014 12:00:00 AM     07/20/2014 13:00:00 PM     Available

should not available anymore but when I try to query out they only take out

   204         07/20/2014 12:00:00 AM     07/20/2014 13:00:00 PM     Available

and 18 and 19 is still come out as available.

It looks like they only know and try to match with checkindate and checkoutdate only so they check 16 and 20 within the date range of 18 to 24(checking available). They don't know 18 and 19 is occupied also.

Here is my query

select distinct (at.RoomNumber), at.RoomID, '', '', '', '', '', '', at.CheckInDate, at.CheckOutDate
from AvailableTest at                       
   join Room r on r.RoomID = at.RoomID 
   join Reservations res on res.RoomID =r.RoomID where 
   ((at.CheckInDate between '07/18/2014 13:00:00 PM' and '07/24/2014 12:00:00 AM')
        or (at.CheckOutDate between '07/18/2014 13:00:00 PM' and '07/24/2014 12:00:00 AM'))
        and at.CheckOutDate not in ( SELECT CheckOutDate  
    FROM reservations rs WHERE ((CheckInDate BETWEEN '07/18/2014 13:00:00 PM' AND '07/24/2014 12:00:00 AM') OR (CheckOutDate BETWEEN '07/18/2014 13:00:00 PM' AND '07/24/2014 12:00:00 AM')) ) and at.CheckInDate  not in ( SELECT  CheckInDate FROM reservations rs WHERE ((at.CheckInDate BETWEEN '07/18/2014 13:00:00 PM' AND  '07/24/2014 12:00:00 AM') OR (at.CheckOutDate BETWEEN '07/18/2014 13:00:00 PM' AND '07/24/2014  12:00:00 AM')) )'

Answer 1

I think you are looking to only get rows from the AvailableTest table for dates that there are no rows in the Reservations table.

SELECT DISTINCT
    r.RoomNumber,
    at.RoomID ,
    '' ,
    '' ,
    '' ,
    '' ,
    '' ,
    '' ,
    at.CheckInDate ,
    at.CheckOutDate
FROM    AvailableTest at
    INNER JOIN Room r
        ON r.RoomID = at.RoomID
    INNER JOIN Reservations res
        ON res.RoomID = r.RoomID
WHERE at.CheckInDate NOT BETWEEN res.CheckInDate AND res.CheckOutDate

There are some design issues with your availabletest table. As it seems you have a checkin/checkout columns though there are only rows for a single date. Just adding a level of complication that isn't needed. I know this as I worked for a Hotel Management company for 10 years.