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SELECT CONCAT_WS('-',YEAR(date_creation),MONTH(date_creation),DAYOFMONTH(date_creation)) AS period FROM piwigo_images
INNER JOIN piwigo_image_category ON id = image_id
    WHERE (category_id NOT IN (127,126,17,105,45,217,79))
AND date_creation IS NOT NULL
GROUP BY period in /home/e-smith/files/ibays/piwigo/html/include/dblayer/functions_mysqli.inc.php on line 864