需要帮助来编写查询 [英] need Help to write a query

问题描述

我正在开发酒店网站.
客房预订的概念
用户可以在此页面上预订房间.

RoomDetails表

RoomCategory Roomno


RoomBooking
用户Roomno ArrivalDate DepartDate


现在，我想编写一个查询来获取那些房间，这些房间只有那些在用户选择日期没有预订的房间.

我写这个查询.但没有得到预期的输出.

I am developing a website on hotel.
There is a concept of Room Booking
User can book there room from this page.

RoomDetails table

RoomCategory Roomno


RoomBooking
User Roomno ArrivalDate DepartDate


Now I want to Write a Query to get the those rooms only those are not booked on the date Choose by the user.

I write this Query. but not getting expected output.

"select top " + DropDownList5.SelectedValue + " roomno from roomdetails where roomno not in (select roomno from roombooking where ((ArrivalDate between '"
                      + dt1 + "' and '" + dt2 + "') or (DepartureDate between '"
                      + dt1 + "' and '" + dt2 + "'))and  Category ='"+DropDownList2.SelectedValue+"') and RoomCategory='"+DropDownList2.SelectedValue+"'"

推荐答案

"select
    top " + DropDownList5.SelectedValue + " roomno
 from roomdetails
 where
    roomno not in
        (
            select roomno
            from roombooking
            where
                (
                    (
                        '" + dt1 + "' between ArrivalDate and DepartureDate
                    )
                )
                and  Category ='"+DropDownList2.SelectedValue+"'
        )
        and RoomCategory='"+DropDownList2.SelectedValue+"'"

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