Liens externes d'une catégorie

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SQL

USE frwiki_p;
SELECT site, COUNT(*) AS LINKS
FROM (SELECT SUBSTRING_INDEX(SUBSTRING(el_to, LOCATE('://', el_to) + 3), '/', 1) AS site
      FROM page tp
      JOIN page mp ON mp.page_namespace = 0 AND mp.page_title = tp.page_title
      JOIN externallinks ON el_from = mp.page_id
      JOIN categorylinks ON cl_from = tp.page_id
      WHERE cl_to IN ('Article utilisant_l'infobox_Épidémie')
      AND tp.page_namespace = 0) sq
GROUP BY site
ORDER BY LINKS DESC

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