Polluted categories in etwiki

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

SQL

USE etwiki_p;
SELECT DISTINCT
  cl_to
FROM categorylinks AS cat
JOIN page AS pg1
ON cat.cl_from = pg1.page_id
WHERE page_namespace = 2
AND EXISTS (SELECT
              1
            FROM page AS pg2
            JOIN categorylinks AS cl
            ON pg2.page_id = cl.cl_from
            WHERE pg2.page_namespace = 0
            AND cat.cl_to = cl.cl_to)
AND cl_to NOT IN (SELECT
                    page_title
                  FROM page
                  JOIN templatelinks
                  ON tl_from = page_id
                  WHERE page_namespace = 14
                  AND tl_namespace = 10
                  AND tl_title = 'Pollutedcat')
LIMIT 250;

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