Percentage of stub categories that are hidden (enwiki)

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

SQL

use enwiki_p;
select
  100 * sum(is_hidden) / count(is_hidden) as percent_hidden
from (
  select
    page_title,
    case
      when cl_to is null then 0
      else 1
    end as is_hidden
  from page
  left join categorylinks
    on page_id = cl_from
    and cl_to = 'Hidden_categories'
  where
    page_namespace = 14 -- Category
    and page_title like '%_stubs'
)

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