MW missing configuration settings

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

SQL

use mediawikiwiki_p;
select
  concat("Extension:",(select page_title from page where page_id=a.cl_from)) as "title"
from
  categorylinks a
where 
  a.cl_to = "All_extensions"
  and exists (
    select
      1
    from
      categorylinks b
    where
      b.cl_from = a.cl_from
   	  and b.cl_to="Pages_kept_for_historical_interest"
  )

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