duplicate on my PDO query - php

Question

Here's my code sir:
<?php
session_start();
include 'include/db_config.php';
$result = $dbs->prepare("SELECT * FROM service_info ORDER BY id DESC");
/*$result->bindParam(':id', $_SESSION['id']);*/
$result->execute();
for($i=0; $row = $result->fetch(); $i++){
$result2 = $dbs->prepare("SELECT *FROM customer_info ORDER BY id DESC");
$result2->execute();
for($j=0; $row2 = $result2->fetch();$j++){
?>
<tr class="record">
<td><?php echo $row2['firstname'];?></td>
<td><?php echo $row['no_guest']; ?></td>
<td><?php echo $row['type_service']; ?></td>
<td><?php echo $row['datepicker']; ?></td>
<td><?php echo $row['t_time']; ?></td>
<td> delete </td>
</tr>
<?php
}
}
?>
i didnt use a LEFT JOIN for displaying data's from 2 tables. i just want to do it in my own way . But my problem is it duplicates my data . before i inserted my second query its just 2 data's and now its 4 already. i just cant figure it out where is the duplication occurs.
Someone help me out please . Thanks in Advance.

Answer 1

You display data in second for, which is inside first for. So you get result count of customer_info table length*service_info length results. You should save info in arrays and then use only one for cycle. Eg.:
<?php
session_start();
include 'include/db_config.php';
$services = array();
$customers = array();
$result = $dbs->prepare("SELECT * FROM service_info ORDER BY id DESC");
/*$result->bindParam(':id', $_SESSION['id']);*/
$result->execute();
for($i=0; $row = $result->fetch(); $i++){
$services[] = $row;
}
$result2 = $dbs->prepare("SELECT *FROM customer_info ORDER BY id DESC");
$result2->execute();
for($j=0; $row2 = $result2->fetch();$j++){
$customers[] = $row2;
}
foreach($services as $key => $service) {
?>
<tr class="record">
<td><?php echo $customers[$key]['firstname'];?></td>
<td><?php echo $service['no_guest']; ?></td>
<td><?php echo $service['type_service']; ?></td>
<td><?php echo $service['datepicker']; ?></td>
<td><?php echo $service['t_time']; ?></td>
<td> delete </td>
</tr>
<?php
}
?>
Btw, i suggest you use different approach, like joins