What is the best/efficient DB Design for a device reservation system?

Question

Hi,
I have to design table structure for a device reservation system. The user can reserve any device for a period of time (start time and end time). 
Based on the reserved devices
1) I need to show on the UI if the device is reserved or available
2) for any logged in user, to reserve, how do I validate and check all the devices and allow the user to reserve the device
with minimal logic
Each reservation for a particular time for a device may be present as one record, when the user is reserving we have to consider the entire set of records to arrive at a conclusion whether the device is reserved or free for that particular amount of time.
How do we do this with minimal logic and what is best db/table design for this kind of system.

Answer 1

You may have a Users/Customers table (contains users personal info)
You may have a Devices table (contains info about devices (name, supplier and etc))
You may have a reservation table that contains a userid + deviceid + startdate + end date+ quantity...
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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