Reservation Query SQL

I have recently been tring to model a hotel reservations database I found the following query online it says it is supposed to query my reservations table for available rooms by date:

FROM tblReservations
WHERE Room_Id NOT in (select Room_Id from tblReservations where     RequestedStartDate <= EndBookingDate and RequestedEndDate >= StartBookingDate );

Question # 1
I am new to sql parameter queries and  what I don't undestand is why I have to input a start bookingdate and an endbookingdate. Shouldn't the user just add the input the requested dates the guest would like to find the rooms available within the time frame

Question # 2
I would like to know if i can insert use this query in a form where the user inserts the request dates via a combo boxes and calendar control, clicks a control button and gets the results in another form.Is this possible using vbcode as well?

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Jeffrey CoachmanMIS LiasonCommented:

Assume the following Data in the tblReservations.

ReservationID,Room_ID,StartBookingDate,End Booking Date

The query works as expected and asks for a Start and End dates.
(Isn't that what you wanted?)

One note though, if a room is not in the Reservations table, it won't ever be displayed as being free.

For example: let's say you have another room, 400. Notice that it is not in tblReservations, because it has NO reservations, so it will not be listed in the query as being free.

So in this case you also need a a table for the Rooms (tblRooms)
Room_ID, RoomCategory, RoomName...ect

This new table must also be included in the query to show rooms that may not have any reservations at all. (Thus they are "available")

Now as far as your second question...
Yes, you can do this with VBA.

Is this question really only worth 55 points to you?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Access

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.