Discuz运营一些常用SQL语句

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清零所有附件下载次数

1. UPDATE pre_forum_attachment SET downloads = 0
   

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清零所有附件下载用户记录

1. 同：清空所有用户的积分变化的记录

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清零所有帖子的访问次数

1. UPDATE pre_forum_thread SET views = 0

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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】

1. DELETE FROM pre_common_credit_log

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清空所有系统提醒消息

1. DELETE FROM pre_home_notification

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清空所有站内短消息

1. DELETE FROM `pre_ucenter_pm_lists` WHERE 1 ;
   
2. DELETE FROM `pre_ucenter_pm_members` WHERE 1 ;
   
3. DELETE FROM `pre_ucenter_pm_members` WHERE 1 ;
   
4. DELETE FROM `pre_ucenter_pm_messages_0` WHERE 1 ;
   
5. DELETE FROM `pre_ucenter_pm_messages_1` WHERE 1 ;
   
6. DELETE FROM `pre_ucenter_pm_messages_2` WHERE 1 ;
   
7. DELETE FROM `pre_ucenter_pm_messages_3` WHERE 1 ;
   
8. DELETE FROM `pre_ucenter_pm_messages_4` WHERE 1 ;
   
9. DELETE FROM `pre_ucenter_pm_messages_5` WHERE 1 ;
   
10. DELETE FROM `pre_ucenter_pm_messages_6` WHERE 1 ;
    
11. DELETE FROM `pre_ucenter_pm_messages_7` WHERE 1 ;
    
12. DELETE FROM `pre_ucenter_pm_messages_8` WHERE 1 ;
    
13. DELETE FROM `pre_ucenter_pm_messages_9` WHERE 1 ;

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