SQL
AخA
USE dewiki_p;
SELECT COUNT(user_registration)
FROM user
INNER JOIN (SELECT
rev_user_text AS edit_username,
COUNT(rev_id) AS edits_month
FROM revision_compat
WHERE rev_timestamp > "20201101000000"
GROUP BY edit_username
) AS last_edits
ON user_name = edit_username
WHERE user_registration > 20210101000000
AND user_registration < 20210201000000
AND edits_month >= "50"
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