由于最适合搭建wordpress的web环境是php+mysql+apache所以在使用wordpreess的过程中必不可少的要接触到一些sql操作，下面介绍一些常用wordpress常用sql查询。

清除Microsoft Word文档中的奇怪字符（有些朋友喜欢用Word文档写文章然后粘贴到wordpress，但是这样有可能会在wordpress数据库中产生一些奇怪的字符。）：

UPDATE wp_posts SET post_content = REPLACE(post_content, '“', '“');
UPDATE wp_posts SET post_content = REPLACE(post_content, 'â€', '”');
UPDATE wp_posts SET post_content = REPLACE(post_content, '’', '’');
UPDATE wp_posts SET post_content = REPLACE(post_content, '‘', '‘');
UPDATE wp_posts SET post_content = REPLACE(post_content, '—', '–');
UPDATE wp_posts SET post_content = REPLACE(post_content, '–', '—');
UPDATE wp_posts SET post_content = REPLACE(post_content, '•', '-');
UPDATE wp_posts SET post_content = REPLACE(post_content, '…', '…');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '“', '“');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, 'â€', '”');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '’', '’');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '‘', '‘');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '—', '–');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '–', '—');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '•', '-');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '…', '…');

使用sql查询更改wordpress用户密码：

UPDATE 'wp_users' SET 'user_pass' = MD5('密码') WHERE 'user_login' ='账户登录名' LIMIT 1;

将某个用户的文章转移到另一个用户：

UPDATE wp_posts SET post_author=新的用户ID WHERE post_author=旧的用户ID;

批量删除垃圾评论：

DELETE from wp_comments WHERE comment_approved = '0';

查找已添加的未使用标签（tag）：

SELECT * From wp_terms wt INNER JOIN wp_term_taxonomy wtt ON wt.term_id=wtt.term_id WHERE wtt.taxonomy='post_tag' AND wtt.count=0;

获取所有评论用户的邮箱号列表：

SELECT DISTINCT comment_author_email FROM wp_comments;

批量禁用所有已开启的插件：

UPDATE wp_options SET option_value = '' WHERE option_name = 'active_plugins';

批量禁止在旧文章中评论：

UPDATE wp_posts SET comment_status = 'closed' WHERE post_date < '2009-01-01' AND post_status = 'publish';
//关闭某时段之前的文章的评论功能日期格式为：年-月-日

以上SQL查询都是以wp_默认前缀为例，使用时请按自己的数据库前缀来进行操作，进行数据库操作前请备份好数据！