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SELECT
  c.*, nb_images, date_last, max_date_last, count_images, count_categories
  FROM piwigo_categories c INNER JOIN piwigo_user_cache_categories
  ON id = cat_id and user_id = 2
  WHERE id_uppercat is NULL

  ORDER BY rank
; in /home/www/nobodyz.net/piwigo/include/functions.inc.php on line 919