Categories under only one hidden category (zhwiki_p)

This query is marked as a draft This query has been published by Tjmj.

SQL

WITH hc AS (
  	-- list of pages under category:隐藏分类
    SELECT p.page_id, p.page_title
	FROM categorylinks c
	LEFT JOIN page p ON (c.cl_from = p.page_id)
  	WHERE c.cl_to = "隐藏分类"
)
-- list of categories under each page
SELECT hc.page_id, hc.page_title, c.cat_pages, COUNT(*) AS cat_count
FROM hc
LEFT JOIN categorylinks c2 ON (hc.page_id = c2.cl_from)
LEFT JOIN category c on (c.cat_title = hc.page_title)
GROUP BY 1, 2, 3
HAVING COUNT(*) = 1
ORDER BY 3 DESC
LIMIT 10

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