External links from pages in either of 2 cats

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

For [[WP:RAQ#Medical external links survey]] circa 30 Aug 2020.

SQL

SELECT site, COUNT(*)
FROM (SELECT REGEXP_REPLACE(el_to, '^(?:[a-z]*:)?//([^/]*)(?:.*)', '\\1') AS site
      FROM externallinks
      JOIN page ON page_id = el_from
      JOIN categorylinks ON cl_from = page_id
      WHERE cl_to IN ('All_WikiProject_Medicine_articles', 'WikiProject_Anatomy_articles')) sq
GROUP BY site;

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