Recursion on categorylinks

SQL

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

select count(distinct page_title) from subcats;
*/

/*
select count(distinct page.page_title) from subcats
join categorylinks on cl_to = subcats.page_title and cl_type = 'page'
join page on cl_from = page_id;
*/

select group_concat(page_title) from categorylinks, page
where cl_type = 'subcat' and cl_from = page_id and cl_to = 'History-related_lists'
SQL

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