Hidden categories of a main namespace page

This query is marked as a draft This query has been published by BDavis (WMF).

Demonstration of joining the page, categorylinks, and page_props tables to find the names of hidden categories that a given page is a member of.

SQL

SELECT p.page_title, cl_to AS hidden_category
FROM page AS p
INNER JOIN categorylinks ON p.page_id = cl_from
INNER JOIN page AS catpage ON catpage.page_namespace = 14 AND catpage.page_title = cl_to
INNER JOIN page_props ON pp_page = catpage.page_id AND pp_propname = 'hiddencat'
WHERE p.page_namespace = 0
  AND p.page_title = 'NOFX';

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