Most frequent dead external links in articles on plwiki

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

SQL

USE plwiki_p;
SELECT el_to, COUNT(*) AS counting
FROM(
SELECT SUBSTRING_INDEX(SUBSTRING(el_to, LOCATE('://', el_to) + 3), '/', 1) AS el_to
FROM externallinks
WHERE el_from IN (SELECT page_id
FROM page
WHERE page_namespace = 1)
) AS tmp
WHERE el_to NOT LIKE 'web.archive.org'
AND el_to NOT LIKE 'toolserver.org'
AND el_to NOT LIKE '%wikipedia.%'
GROUP BY el_to
HAVING counting >= 12
ORDER BY counting DESC, el_to;

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