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Halfak (WMF)
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SELECT page_title, SUM(DATEDIFF(rev_timestamp, user_registration) < 30)/COUNT(*) AS newbie_prop FROM revision_userindex INNER JOIN page ON page_id = rev_page INNER JOIN user ON user_id = rev_user WHERE page_namespace = 0 AND page_title IN ("Anachronism", "GroupLens_Research", "Waffle") GROUP BY page_title;
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