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SELECT u.NAME, extract(YEAR_MONTH FROM create_time) ym, COUNT(DISTINCT DAY(create_time)) `count` 
FROM osc_opt_logs o, osc_users u WHERE o. USER = u.id 
AND u.id IN ( xxx , xxx, xxx, xxx, xxx) 
AND ( DATE_SUB(CURDATE(), INTERVAL 1 MONTH) <= o.create_time ) 
GROUP BY USER, ym ORDER BY ym DESC, `count` desc;