categories by number of used contained files

This query is marked as a draft This query has been published by XXN.

SQL

use ruwiki_p;
  SELECT cl_to, COUNT(page_title) AS Files
   FROM image, page, categorylinks, imagelinks 
   WHERE page.page_id=categorylinks.cl_from 
     AND page.page_title=il_to AND image.img_name = page.page_title
AND cl_type="file" AND page_namespace=6 
AND il_to IS NOT NULL
GROUP BY cl_to
having Files > 20
ORDER BY Files DESC;

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