Non-article pages in article-only categories

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

SQL

use fawiki_p;

select
  page_namespace,
  page_title,
  cl_to
from page
join categorylinks
  on page_id = cl_from
and cl_to in (
  select cl_to
  from (
    select
      cl_to,
      100 * sum(case when page_namespace = 0 then 1 else 0 end) / count(*) as proportion
    from categorylinks
    join page
      on page_id = cl_from
    group by cl_to
  ) t
  where
    t.proportion > 50
    and t.proportion < 100
)
where
  page_namespace <> 0
  and page_is_namespace = 0
limit 500

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