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How to prevent double booking


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I am facing a problem with double booking , i don't know where to start to write the code that a customer can't rental the same car at for the same day. For example, if a customer choose to book car A from 1/8/2018 till 10/8/2018 , how do i avoid that other customer won't book on the date 1/8/2018 or even 2/8/2018 and so on. Pls help me is quiet urgent

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Easiest way...

+--------------+                                +-------------+
|   Car        |                                | customer    |
+--------------+                                +-------------+
| car_id  (PK) |--+                          +--| cust_id (PK)|
| reg_no       |  |                          |  | name        |
| make         |  |                          |  +-------------+
| model        |  |                          |
+--------------+  |                          |
                  |                          |
                  |   +-------------------+  |
                  |   |  booking          |  |
                  |   +-------------------+  |
                  |   |  booking_id  (PK) |  |
                  +--<|  car_id      (UQ) |  |
                      |  hire_date   (UQ) |  |
                      |  cust_id          |>-+

In the booking table (car_id, hire_date) is defined as a unique key and a record is written for each day that the car is hired. Because the key is unique, booking it to another customer on one of those dates will throw an error and the transaction should be cancelled.

Edited by Barand
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