How many stub categories is an article in on fawiki?

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

SQL

use fawiki_p;
select
  stubcatcount,
  count(*) as freq
from (
  select
    page_title,
    sum(stubcat) as stubcatcount
  from (
    select
      page_title,
      case
        when cl_to is null then 0
        else 1
      end as stubcat
    from page
    left join categorylinks
      on cl_from = page_id
      and cl_to like '%_خرد_%'
    where page_namespace = 0
  ) T
  group by page_title
) S
group by stubcatcount

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