<form class="form-horizontal" role="form" method="post">
    <div class="form-group">
        <label for="inputLocation" class="col-sm-2 control-label">Location</label>
        <div class="col-sm-4">
<?php
 
$queryData = mysql_query("SELECT DISTINCT cat_name as cat_name FROM 'categories' ORDER BY `cat_name`");
$result = mysql_fetch_array($queryData);   //$result now has database tables
?>
<select name='cat_name'>
<?php
foreach($result as $row)
{
    ?>
        <option values=<?php echo($row['cat_name']); ?><?php echo($row['cat_name']); ?></option>
    <?php
}
?>  </select>
 
        </div>
    </div>
</form>

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