Customers pick When finished If on the book, such as the selection of Van Dyke VT01 from 1/07/59 - 2/07/59-day period, you will not be able to book your car again. It is based on the availability of the vehicle.

I made a separate table Storage booking Van table separately too.

Tables, storage, booked by id_car I take from the table and put the van.

Table of van

This is the code that I defined it booked only three people per day.

$date = "$rn_gostart"; //กำหนดค้นวันที่  

$result = mysqli_query($mysqli,"select * from vn_rent where rn_gostart = '$date'");  
$ckd = mysqli_num_rows($result);  

if($ckd >= 3){  

$msg = "<div class='alert alert-danger'>  
<span class='glyphicon glyphicon-info-sign'></span> &nbsp; วันที่จองเต็มแล้ว  

Sorry I am not good at English Please help me