有些站长朋友使用wordpress做采集站，不断的云采集各类文章自动发布到自己的网站上。但采集站最大的问题就是会采集到很多重复文章。这时，我们需将采集过来的重复文章进行去重处理。

以下是二种一次性去除标题重复文章的方法：

1. 去除重复文章，只保留一篇 (只测试了这一种方法，确实有效，删除前一定要备份数据)

   CREATE TABLE my_tmp AS SELECT MIN(ID) AS col1 FROM wp_posts GROUP BY post_title;
   DELETE FROM wp_posts WHERE ID NOT IN (SELECT col1 FROM my_tmp);
   DROP TABLE my_tmp;

2. 去除重复文章，一篇都不保留

   CREATE TABLE my_tmp AS Select ID AS col1 From wp_posts Where post_title In (Select post_title From wp_posts Group By post_title Having Count(*)>2);
   DELETE FROM wp_posts WHERE ID IN (SELECT col1 FROM my_tmp);
   DROP TABLE my_tmp;

3. 另一种去除所有重复文章的方法

   CREATE TABLE my_tmp AS Select ID AS col1 From wp_posts Where post_title In (Select post_title From wp_posts Group By post_title Having Count(*)>2);DELETE FROM wp_posts WHERE ID IN (SELECT col1 FROM my_tmp); DROP TABLE my_tmp;

操作方法很简单，只需将上面的SQL语句，放到自己网站数据库的 SQL框里，然后执行就可以了。（注意：操作之前，请先进行网站备份）

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