Discuz运营一些常用SQL语句
清零所有附件下载次数UPDATE pre_forum_attachment SET downloads = 0
清零所有附件下载用户记录
同：清空所有用户的积分变化的记录清零所有帖子的访问次数
UPDATE pre_forum_thread SET views = 0清空所有用户的积分变化的记录【不是把所有用户的积分变成0，只是每次积分变化的记录】
DELETE FROM pre_common_credit_log清空所有系统提醒消息
DELETE FROM pre_home_notification清空所有站内短消息
DELETE FROM `pre_ucenter_pm_lists` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_members` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_members` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_0` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_1` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_2` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_3` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_4` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_5` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_6` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_7` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_8` WHERE 1 ;
DELETE FROM `pre_ucenter_pm_messages_9` WHERE 1 ;
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