DELETE FROM user_sect  WHERE user_status = 1 and create_time <= DATE_SUB(CURDATE(),INTERVAL 2 DAY);





SELECT * FROM user_sect  WHERE user_status = 1 and create_time <= DATE_SUB(CURDATE(),INTERVAL 2 DAY);



from user_sect where user_status = 1 and id = " + id + "  and DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= last_modified_time  order by create_time desc




如果要3天前(即保留今天,昨天,前天的数据) --------------->  interval 1 day

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