SQL
AخA
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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