Reverse recursion on categorylinks

SQL

set max_recursive_iterations=3;

with recursive subcats (path, cat_title) as (
  select cl_to, cl_to from categorylinks where cl_type = 'page' and cl_from in (
    select page_id from page where page_title = 'Sabine_Stuart_de_Chevalier' and page_namespace = 0
  )
  union all
  select concat(path, ',', cl_to), cl_to from subcats
  join page on page_title = cat_title and page_namespace = 14
  join categorylinks on cl_from = page_id and cl_type = 'subcat'
)
-- cycle cat_title restrict
select count(*) from subcats;
-- select min(depth), max(depth), cat_title, count(*) from subcats group by cat_title order by count(depth) desc limit 10;

-- select count(distinct cl_from) from subcats
-- join categorylinks on cl_to = cat_title and cl_type != 'subcat'
-- where cat_title not in (select cat_title from category where cat_pages = 0)
-- join page on cl_from = page_id
-- order by page_namespace;

/*
select cl_to from categorylinks where cl_type = 'page' and cl_from in (
  select page_id from page where page_title = 'Sabine_Stuart_de_Chevalier' and page_namespace = 0
)
*/
SQL

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