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SELECT tag_id, COUNT(DISTINCT(it.image_id)) AS counter
  FROM piwigo_image_category ic
    INNER JOIN piwigo_image_tag it
    ON ic.image_id=it.image_id
   WHERE  (category_id NOT IN (9,10,11,84,76,75) AND ic.image_id NOT IN (1413,1421,1422,1427,1446,1602,1710,1711,1722,1725,1734,1744,1764,1765,1771,1772,1773,1797,1805,1817,1823,1827,1828,1834,1837,1839,1846,1848,1850))
  GROUP BY tag_id
; in /home/imartins/public_html/fotos/include/dblayer/functions_mysqli.inc.php on line 856