Stub-class critically endangered species articles

SQL

# Category of the mainspace article
SET @MAIN_CAT = REPLACE(
  ## vv   CHANGE ME   vv
  "IUCN Red List critically endangered species"
  ## ^^   CHANGE ME   ^^
  , " ", "_");
# Class category
SET @CLASS_CAT = REPLACE(
  ## vv   CHANGE ME   vv
  "Stub-Class articles"
  ## ^^   CHANGE ME   ^^
  , " ", "_");

# GO
SELECT 
	REPLACE(p1.page_title, "_", " ") AS `Page title`,
    REPLACE(GROUP_CONCAT(cl2.cl_to SEPARATOR ", "), "_", " ") AS "Stub category",
    (SELECT COUNT(*) FROM pagelinks pl WHERE pl.pl_namespace = 0 AND pl_title = p1.page_title) AS `Inbound links`,
    p1.page_len AS "Length"
FROM categorylinks cl1
LEFT JOIN page p1 ON cl1.cl_from = p1.page_id
INNER JOIN page p2 ON p2.page_title = p1.page_title AND p2.page_namespace = (p1.page_namespace + 1)
INNER JOIN categorylinks cl2 ON cl2.cl_from = p2.page_id AND ((
  SELECT COUNT(*) FROM categorylinks cls2 WHERE cls2.cl_to = @CLASS_CAT AND cls2.cl_from = (
  	SELECT ps2.page_id FROM page ps2 WHERE ps2.page_title = cl2.cl_to AND ps2.page_namespace = 14 # Category
  )
) > 0)
WHERE cl1.cl_to = @MAIN_CAT
GROUP BY `Page title`
ORDER BY `Inbound links` DESC
SQL

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