SQL
AخA
USE enwiki_p;
SELECT COUNT(DISTINCT rev_page) FROM revision
join page on rev_page = page_id
WHERE rev_user IN ('14100094','20921234','21497175','23080989','18934424','23142567')
AND rev_timestamp > '20150101000001'
AND rev_timestamp < '20150630235959'
AND page_namespace = 0
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