This query is marked as a draft This query has been published by R'n'B.

SQL

AخA
 
SELECT CONCAT("Category:", REPLACE(page_title, "_", " ")) AS title
FROM page 
JOIN categorylinks ON cl_from = page_id 
WHERE cl_to = "Hidden_categories" 
      AND NOT EXISTS (SELECT * FROM page_props WHERE pp_page = page_id AND pp_propname = "hiddencat")
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