请事先备份数据库

经测试执行后需要更新缓存，否则发新帖子有问题

后台执行如下Sql语句即可。建议在网络比较畅快的时候使用，数据库过大不建议使用
不过重复帖子一般源于采集，呵呵

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create table bak as (select * from cdb_threads group by subject having count(*)=1);     
insert into bak (select * from cdb_threads group by subject having count(*)>1);   
truncate table cdb_threads;   
insert into cdb_threads select * from bak;
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此Sql语句可以删除任何的重复数据，红色部分为表名 绿色部分为字段值

注释版：

create table bak as (select * from cdb_threads group by subject having count(*)=1);
新建bak 然后把帖子没有重复的写进去
insert into bak (select * from cdb_threads group by subject having count(*)>1);
然后再把不止一条，也就是重复的也写入
truncate table cdb_threads;
删除
insert into cdb_threads select * from bak;
把文件从BAK中写入回数据库