Recursion on categorylinks

This query is marked as a draft This query has been published by EqJjgOa8rVvsRmZL.

SQL

with recursive subcats as (
  select page_title from categorylinks, page
  where cl_to = 'Lists_of_events' and page_id = cl_from and cl_type = 'subcat'
  union all
  select page.page_title from subcats, categorylinks, page
  where cl_type = 'subcat' and cl_to = subcats.page_title and page_id = cl_from
)

select count(distinct page_title) from subcats;

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