SQL
AخA
SELECT Count( DISTINCT page_title )
FROM categorylinks
JOIN page
ON cl_from = page_id
JOIN user
ON user_name = page_title
JOIN actor
ON actor_user = user_id
JOIN recentchanges_userindex
ON rc_actor = actor_id
WHERE cl_to = 'Retired_Wikipedians'
AND (
page_namespace = 2
OR page_namespace = 3) ;
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