添加另一个查询以添加到页面

I am suck on some code here. It displays an article as a result of clicking on a link from another page displaying title and content etc.

My issue is I need a different record set to appear on the page as well what is here.

In this case it would be a list of all the other titles which have the same ‘artcampaign’ number as the article loaded. Kind of like a related articles or full list within this category. Any help appreciated with this.

$sql = "
SELECT articles.id AS articleid, articles.art_title AS title, articles.art_url AS art_url, articles.art_content AS content, campaigns.id, campaigns.camp_title AS camptitle, campaigns.camp_name AS campname, campaigns.camp_url AS camp_url
FROM articles
LEFT JOIN campaigns ON articles.art_campaign = campaigns.id
WHERE art_url = ?";

    $stmt = $db->prepare($sql);
    $stmt->bind_param('s', $_GET['art_url']); // assuming it's a string?
    $results = $stmt->execute();

        echo "
        <h2>{$campname}</h2>
        <H3>{$camptitle}</H3>
        <H4>{$title}</H4>
        ";
?>
        <div class='right-section'>
        <h5><?php echo "{$campname}"; ?> Links</h5>
        <ul calss='section-list'>
            <li>dummy text</li>
        </ul>
        </div>
        <?php echo "{$content}"; ?>
        </div>