SQL处理一些问题比手工要方便的多，然而对SQL操作存在一定的风险性，操作之前最好做好数据备份。下面为大家介绍18条wordpress SQL查询，你可能啥时候就会需要到。

使用方法：
进入你主机的phpmyadmin，选择你的WordPress数据，点击SQL选项卡，在文本框中输入SQL查询语句，执行！

高度注意：

在每次执行SQL语句前，请勿必备份你的WordPress数据库。

1. 删除所有未使用的标签

DELETE a,b,c FROM wp_terms AS a LEFT JOIN wp_term_taxonomy AS c ON a.term_id = c.term_id LEFT JOIN wp_term_relationships AS b ON b.term_taxonomy_id =
c.term_taxonomy_id WHERE c.taxonomy = ‘post_tag’ AND c.count = 0
2. 删除所有文章修订版本(Revisions)以及它们的Meta数据

DELETE a,b,c FROM wp_posts a LEFT JOIN wp_term_relationships b ON (a.ID = b.object_id) LEFT JOIN wp_postmeta c ON (a.ID = c.post_id) WHERE a.post_
type = ‘revision’
3. 更改WordPress地址和首页地址

UPDATE wp_options SET option_value = replace(option_value, ‘http://www.旧网址.com’, ‘http://www.新网址.com’) WHERE option_name = ‘home’ OR option_
name = ‘siteurl’
4. 更改文章的GUID

UPDATE wp_posts SET guid = REPLACE (guid, ‘http://www.旧网址.com’, ‘http://www.新网址.com’)
5. 更改正文中的链接地址

UPDATE wp_posts SET post_content = REPLACE (post_content, ‘http://www.旧网址.com’, ‘http://www.新网址.com’)
6. 更新文章的Meta值

UPDATE wp_postmeta SET meta_value = REPLACE (meta_value, ‘http://www.旧网址.com’, ‘http://www.新网址.com’
7. 重设Admin密码

UPDATE wp_users SET user_pass = MD5( ‘new_password’ ) WHERE user_login = ‘admin’
8. 重设admin的用户名

UPDATE wp_users SET user_login = ‘newname’ WHERE user_login = ‘admin’
9. 将作者a的文章全部转移到作者b

UPDATE wp_posts SET post_author = ‘b’ WHERE post_author = ‘a’
10. 删除文章的meta标签

DELETE FROM wp_postmeta WHERE meta_key = ‘your-meta-key’
11. 导出所有评论中的邮件地址

SELECT DISTINCT comment_author_email FROM wp_comments
12. 删除所有的Pingback

DELETE FROM wp_comments WHERE comment_type = ‘pingback’
13. 删除所有的垃圾评论

DELETE FROM wp_comments WHERE comment_approved = ‘spam’
14. 禁用所有激活的插件

UPDATE wp_options SET option_value = ” WHERE option_name = ‘active_plugins’
15. 罗列所有未使用的Meta标签

SELECT * FROM wp_postmeta pm LEFT JOIN wp_posts wp ON wp.ID = pm.post_id WHERE wp.ID IS NULL
16. 关闭旧文章的留言

UPDATE wp_posts SET comment_status = ‘closed’ WHERE post_date < ‘2009-01-01’ AND post_status = ‘publish’
17. 更新留言者的网址

UPDATE wp_comments SET comment_author_url = REPLACE( comment_author_url, ‘http://旧网址.com’, ‘http://新网址.com’ )
18. 更新正文内所有的’target=”_blank”‘为’rel=”nofollow”‘

UPDATE wp_posts SET post_content = REPLACE (post_content, ‘target=”_blank’, ‘rel=”nofollow’)(以上内容转载于帕兰映像）。