Articles with categories that don't exist

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

SQL

SELECT CONCAT('https://en.wikipedia.org/wiki/', p.page_title) AS 'Article', GROUP_CONCAT(cl.cl_to SEPARATOR ', ') AS 'Non-existent categories'
FROM categorylinks cl
INNER JOIN page p ON p.page_namespace = 0 AND p.page_id = cl.cl_from
LEFT JOIN page p2 ON p2.page_namespace = 14 AND p2.page_title = cl.cl_to
WHERE p2.page_id IS NULL
GROUP BY p.page_title

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