$rep_metas = array(
    'cidade',
    'estado',
    'endereco',
    'telefone_1',
    'telefone_2',
    'website',
    'email',
    'marca'
);

$sql = "SELECT $wpdb->posts.ID, $wpdb->posts.post_title, $wpdb->posts.post_name, ";

foreach ($rep_metas as $key => $post_meta) {
    $sql .= "pm".$key.".meta_value AS ".$post_meta.", ";
}

$sql = substr($sql, 0, -2)." ";
$sql .= "FROM $wpdb->posts ";

foreach ($rep_metas as $key => $post_meta) {
    $sql .= "
        LEFT OUTER JOIN $wpdb->postmeta pm".$key."
        ON $wpdb->posts.ID = pm".$key.".post_id && pm".$key.".meta_key = '".$post_meta."'
    ";
}

$sql .= "WHERE $wpdb->posts.post_status = 'publish' ";
$sql .= "AND $wpdb->posts.post_type = 'distribuidor' ";

$sql .= "AND pm1.meta_value = '".$param['estado']."' ";

if($param['cidade'] != '0'){
    $sql .= "AND pm0.meta_value = '".$param['cidade']."' ";
}

$sql .= "ORDER BY $wpdb->posts.post_title DESC ";


$response = $wpdb->get_results($sql, OBJECT );