Pages under Category:Wikipedia vital articles by level by topic

SQL

SET @basecat='Fields\x5fof\x5fmathematics';
SET max_recursive_iterations=7;

WITH RECURSIVE deepcat (subcat, catpath, depth) AS
(
  SELECT REPLACE(@basecat, '_', ' '), REPLACE(@basecat, '_', ' '), 0

  UNION

  SELECT page_title, CONCAT(catpath, ' > ', REPLACE(page_title, '_', ' ')), depth + 1
  FROM categorylinks
  JOIN page ON page_id = cl_from AND page_namespace = 14
  JOIN deepcat ON cl_to = subcat
)
SELECT DISTINCT REPLACE(page_title, '_', ' ') AS title,
       MIN(depth),
       MIN(catpath) OVER (PARTITION BY page_title ORDER BY depth ASC) AS 'category path'
FROM page
JOIN categorylinks ON cl_from = page_id
JOIN deepcat ON cl_to = subcat
WHERE page_namespace = 0
  AND page_is_redirect = 0
  AND LOWER(CONVERT(page_title USING 'utf8')) RLIKE '(\\b|_)(alpha|beta|gamma|delta|epsilon|zeta|eta|theta|iota|kappa|lambda|mu|nu|xi|omicron|pi|rho|sigma|tau|upsilon|phi|chi|psi|omega)(\\b|_)'
GROUP BY page_title
ORDER BY MIN(depth) ASC;
SQL

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