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SELECT DISTINCT(DAYOFMONTH(date_creation)) as period,
  COUNT(DISTINCT id) as nb_images FROM piwigo_images
INNER JOIN piwigo_image_category ON id = image_id
WHERE category_id IN (47)
     AND date_creation BETWEEN '2013-10-01' AND '2013-10-31 23:59:59'
  GROUP BY period; in /home/e-smith/files/ibays/piwigo/html/include/dblayer/functions_mysqli.inc.php on line 864