WordPress是一套非常好的CSM（或者叫做BLOG）系統，其實它早已經超越了BLOG系統。功能強大，操作簡單，插件繁多。下面是對WordPress操作的18條WordPress SQL查詢語句（不僅僅是查詢語句），還有刪除和修改語句。

1. 刪除所有未使用的標簽

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. 刪除所有文章修訂版本(Revisions)以及它們的Meta數據

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地址和首頁地址

UPDATE wp_options
SET option_value = replace(option_value, 'http://www.舊網址.com', 'http://www.新網址.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.舊網址.com', 'http://www.新網址.com')

5. 更改正文中的鏈接地址

UPDATE wp_posts
SET post_content = REPLACE (post_content, 'http://www.舊網址.com', 'http://www.新網址.com')

6. 更新文章的Meta值

UPDATE wp_postmeta
SET meta_value = REPLACE (meta_value, 'http://www.舊網址.com', 'http://www.新網址.com'

7. 重設Admin密碼

UPDATE wp_users
SET user_pass = MD5( 'new_password' )
WHERE user_login = 'admin'

8. 重設admin的用戶名

UPDATE wp_users
SET user_login = 'newname'
WHERE user_login = 'admin'

9. 將作者a的文章全部轉移到作者b

UPDATE wp_posts
SET post_author = 'b'
WHERE post_author = 'a'

10. 刪除文章的meta標簽

DELETE FROM wp_postmeta
WHERE meta_key = 'your-meta-key'

11. 導出所有評論中的郵件地址

SELECT DISTINCT comment_author_email
FROM wp_comments

12. 刪除所有的Pingback

DELETE FROM wp_comments
WHERE comment_type = 'pingback'

13. 刪除所有的垃圾評論

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. 羅列所有未使用的Meta標簽

SELECT *
FROM wp_postmeta pm
LEFT JOIN wp_posts wp ON wp.ID = pm.post_id
WHERE  wp.ID IS NULL

16. 關閉舊文章的留言

UPDATE wp_posts
SET comment_status = 'closed'
WHERE post_date < '2009-01-01' AND post_status = 'publish'

17. 更新留言者的網址

UPDATE wp_comments
SET comment_author_url = REPLACE( comment_author_url, 'http://舊網址.com', 'http://新網址.com' )

18. 更新正文內所有的’target=”_blank”‘為’rel=”nofollow”‘

UPDATE wp_posts
SET post_content = REPLACE (post_content, 'target="_blank',  'rel="nofollow')

注意：在每次執行SQL語句前，請勿必備份你的WordPress數據庫。