Поиск дублей в поле

dublicatephp

$q = $modx->newQuery('msProductData');
$q->select('id,COUNT(article) as count,article');


$q->groupby('article');
$q->having('count > 1');

$q->prepare(); echo '<pre>'; print_r($q->toSQL()); die;
if ($q->prepare() && $q->stmt->execute()){
    while ($row = $q->stmt->fetch(PDO::FETCH_ASSOC)) {
        $rows[] = $row;
    }
}

echo '<pre>';
print_r($rows); die;