Join two tables by name for dropdown list - php

Question

I have a script that is reading my wheel brands. If I select a wheel it show all the wheels from that brand...
But because I did GROUP BY merk_naam so in my dropdown there wont be 100 same brands I cant show them all...
Can somebody help me with the following:
I have two tables now:
Table 1: it_merken
Table 1
Table 2: it_merken2
Table 2
I want the merk_naam in a dropdown list
But when I do that I get a lot of double ones like AS 2 time in this example...
I want to JOIN in table 1 and table 2 the merk_naam in one query...
I cant figure out how...
Can somebody help me out?
This is the class I got now with the GROUP BY:
<?php
class merken extends connect
{
/**
* Merken lijst
*
* #param object
*/
private $merkenlijst;
/**
* Vraag merken op uit database
*
* #param int $id
* #return array
*/
public function getMerken($database, $id = NULL)
{
$sql = "SELECT merk_code, merk_logo, merk_naam, wiel_foto, wiel_nummer, wiel_info FROM ".$database."_merken";
if(!empty($id))
{
$sql .= " WHERE merk_code=:id";
}
else
{
$sql .= " GROUP BY merk_naam";
}
try
{
$stmt = $this->db->prepare($sql);
if(!empty($id)){ $stmt->bindParam(":id", $id, PDO::PARAM_STR); }
$stmt->execute();
$this->merkenlijst = $stmt->fetchAll(PDO::FETCH_OBJ);
$stmt->closeCursor();
return $this->merkenlijst;
}
catch (Exception $e)
{
die ( $e->getMessage() );
}
}
/**
* Maak een database object en sla de data op
*
* #param object $dbo
* #return void
*/
public function __construct($dbo = NULL)
{
/*
* Roep de parent constructor aan om te controleren op
* een database object
*/
parent::__construct($dbo);
}
}
?>
That is given me each brand one time in my dropdown but when I select nothing, I want to show all brands and because I use GROUP BY now I only see one wheel per brand after submit.
This is my PHP and HTML:
<div class="bandwielkolom">
<form name="wielenzoeken" action="index.php?lang=<?php echo $lang; ?>&p=<?php echo $_GET['p']; ?>#keuze" method="post">
<table class="wielentabel">
<tr>
<th colspan="2"><?php echo $searchwheelsbybrand; ?><a name="wiel"></a></th>
</tr>
<tr>
<td><?php echo $brand; ?>:</td>
<td>
<select name="wiel_merk" onchange="enable()">
<option value="0">- <?php echo $brand; ?> -</option>
<?php
$merken = $merkclass->getMerken($website, $merk);
foreach($merken as $merk)
{
echo "\t\t\t\t\t\t\t\t\t\t\t<option value=\"".$merk->merk_code."\"";
if(isset($_GET['search']) && $_GET['search'] == "wiel" && isset($_GET['merk']) && $_GET['merk'] != "0" || isset($_POST['wiel_submit']) && $_POST['wiel_merk'] != "0") { echo " selected=\"selected\""; }
echo ">".$merk->merk_naam."</option>\n";
}
?>
</select>
</td>
</tr>
<tr>
<td> </td>
<td><input type="submit" name="wiel_submit" value="<?php echo $search; ?>"/></td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</table>
</form>
</div>
</div>
<div class="clearboth"></div>
<div id="main-right">
<?php
foreach($teksten as $tekst)
{
?>
<h1><strong><?php echo $tekst->tekst_header; ?></strong></h1>
<?php echo $tekst->tekst_content."\n"; ?>
<?php
if(!empty($tekst->tekst_img))
{
?>
<div class="imgcontainer">
<div class="imgcontent">
<img src="<?php echo $tekst->tekst_img; ?>" class="content_image" alt="<?php echo $tekst->tekst_header; ?>" />
</div>
</div>
<?php
}
?>
<?php
}
?>
</div>
</div>
<div class="clearboth"></div>
<div id="main-left">
<ul class="wheels">
<?php
if(isset($_POST['wiel_submit']) && $_POST['wiel_submit'] == $search || isset($_GET['merk']))
{
$merk = NULL;
if(isset($_POST['wiel_submit']) && $_POST['wiel_submit'] == $search)
{
echo "\t\t\t\t\t<h2>".$brandselection."</h2>
\t\t\t\t\t<br />\n";
$merk = $_POST['wiel_merk'];
}
?>
<?php
$merken = $merkclass->getMerken($website, $merk);
foreach($merken as $merk)
{
?>
<li><span class="title"><?php echo $merk->wiel_info; ?></span>
<a href="http://www.website.nl/website/images/w3/<?php echo $merk->wiel_foto; ?>" class="preview" title="Fotonummer: <?php echo $merk->wiel_foto; ?>">
<img src="http://www.website.nl/website/images/w3/<?php echo $merk->wiel_foto; ?>" alt="Fotonummer: <?php echo $merk->wiel_foto; ?>" class="wheelImg"/>
</a>
<span class="descr">
<img src="http://www.website.net/preview/bnet/logos/<?php echo str_replace(".png", "_100.png", $merk->merk_logo); ?>" style="padding-left:45px;" width="100" class="logo-merk" alt="<?php echo $merk->merk_naam; ?>"/>
</span>
</li>
<?php
}
?>
</ul>
<?php
}
?>
</div>
Any help is welcome because I can't figure it out!

Answer 1

You are getting doubles because some some of the fields in your SQL do not match, so you get a record for each.