Structuring MySQL query efficiently - php

Question

I'm looking for some help in how best to structure a MySQL query and display the results. I am trying to create a table on a PHP page which has 7 dates across the top and room numbers down the side. In the table, if a person is in a room on the given date then their name appears. I have the following tables:
Table: rooms
Fields: id, room
Table: bookings
Fields: id, name, room, checkin, checkout
The code I currently have is:
<? $start = date('Y-m-d');
$end = date('Y-m-d', strtotime($start." + 6 day")); ?>
<table class="table1">
<thead>
<tr>
<th></th>
<th scope="col"><?= date('d-m', strtotime($start)); ?></th>
<th scope="col"><?= date('d-m', strtotime($start." + 1 day")); ?></th>
<th scope="col"><?= date('d-m', strtotime($start." + 2 day")); ?></th>
<th scope="col"><?= date('d-m', strtotime($start." + 3 day")); ?></th>
<th scope="col"><?= date('d-m', strtotime($start." + 4 day")); ?></th>
<th scope="col"><?= date('d-m', strtotime($start." + 5 day")); ?></th>
<th scope="col"><?= date('d-m', strtotime($start." + 6 day")); ?></th>
</tr>
</thead>
<tbody>
<? $q1 = mysqli_query($con,"SELECT * FROM rooms GROUP BY room");
while($row1 = mysqli_fetch_assoc($q1)){ ?>
<tr>
<th><?= $row1['room']; ?></th>
<? $i = 0;
while ($i <= 6) { ?>
<td>
<? $q2 = mysqli_query($con,"SELECT * FROM bookings WHERE ((checkin BETWEEN '$start' and '$end') or (checkout BETWEEN '$start' and '$end') or (checkin <= '$start' AND checkout >= '$end')) and room = '$row1[room]'");
while($row2 = mysqli_fetch_assoc($q2)){
if ($row2['checkout'] > date('Y-m-d', strtotime($start." + ".$i." day")) and $row2['checkin'] <= date('Y-m-d', strtotime($start." + ".$i." day"))) {
echo $row2['name'];
}
} ?>
</td>
<? ++$i;
} ?>
</tr>
<? } ?>
</tbody>
</table>
This code currently produces the result I need however, I'm worried that it's inefficient because of the amount of loops and queries it runs to get the data.
Can anyone suggest a better way of formatting the query/result?

Answer 1

I think the logic you want in the where clause is:
checkin <= '$end' AND checkout >= '$start' and room = '$row1[room]'
A room is occupied between the two dates when the checking is before the end date and the checkout is after the start date.
EDIT:
The clause you have is:
checkin <= '$start' AND checkout >= '$end'
That is different from my solution.