Category path of article

SQL

SET @basecat='Deaths by year';
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(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_title = 'Elena_Kagan_Supreme_Court_nomination';
SQL

Checking query status...
