SELECT page_title FROM page

JOIN categorylinks ON cl_from = page_id

JOIN templatelinks ON tl_from = page_id

JOIN linktarget ON tl_target_id = lt_id

WHERE page_namespace = 6

AND cl_to IN (

  SELECT page_title FROM page

  JOIN categorylinks ON page_id = cl_from

  WHERE cl_to = 'Media_needing_categories'

) AND lt_namespace = 10

AND lt_title = 'Cs'

ORDER BY page_title;

/*

SELECT CONCAT('#[[:File:', files.page_title, ']]') AS wikitext

FROM categorylinks AS categories

JOIN page AS cat_page ON cat_page.page_id = categories.cl_from

JOIN categorylinks AS cl_files ON cl_files.cl_to = cat_page.page_title

JOIN templatelinks ON tl_from = cl_files.cl_from

JOIN page AS files ON files.page_id = cl_files.cl_from

WHERE categories.cl_to = 'Media_needing_categories'

AND categories.cl_type = 'subcat' AND cat_page.page_namespace = 14

AND cl_files.cl_type = 'file' AND files.page_namespace = 6

AND tl_namespace = 10 AND tl_title = 'Cs'

ORDER BY files.page_title;

*/