nlwiki Category sort key equal to category name

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

SQL

SELECT page_namespace AS ns, page_title, GROUP_CONCAT(cl_sortkey_prefix SEPARATOR ' | ') AS `cat(s)`
FROM categorylinks INNER JOIN page ON cl_from=page_id
WHERE cl_sortkey_prefix=cl_to OR cl_sortkey_prefix=REPLACE(cl_to,'_',' ')
ORDER BY page_namespace, page_title
GROUP BY page_namespace, page_title

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