SQL
x
SELECT site, COUNT(*)
FROM (SELECT REGEXP_REPLACE(el_to, '^(?:[a-z]*:)?//([^/]*)(?:.*)', '\\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 ('All_WikiProject_Medicine_articles', 'WikiProject_Anatomy_articles')
AND tp.page_namespace = 1) sq
GROUP BY site;
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