Revealed: List of the Popular WP MySQL Snippets

A collection of useful MySQL snippets for WordPress gathered from various posts on the internet.

# Change Siteurl & Homeurl
UPDATE wp_options SET option_value = replace(option_value, 'http://www.oldsiteurl.com', 'http://www.newsiteurl.com') WHERE option_name = 'home' OR option_name = 'siteurl';

# Change GUID
UPDATE wp_posts SET guid = REPLACE (guid, 'http://www.oldsiteurl.com', 'http://www.newsiteurl.com');

# Change URL in Content
UPDATE wp_posts SET post_content = REPLACE (post_content, 'http://www.oldsiteurl.com', 'http://www.newsiteurl.com');

# Change Image Path Only
UPDATE wp_posts SET post_content = REPLACE (post_content, 'src="http://www.oldsiteurl.com', 'src="http://yourcdn.newsiteurl.com');
UPDATE wp_posts SET  guid = REPLACE (guid, 'http://www.oldsiteurl.com', 'http://yourcdn.newsiteurl.com') WHERE post_type = 'attachment';

# Update Post Meta
UPDATE wp_postmeta SET meta_value = REPLACE (meta_value, 'http://www.oldsiteurl.com','http://www.newsiteurl.com');

# Change Default "Admin" Username
UPDATE wp_users SET user_login = 'Your New Username' WHERE user_login = 'Admin';

# Reset Password
UPDATE wp_users SET user_pass = MD5( 'new_password' ) WHERE user_login = 'your-username';

# Assign all articles by Author B to Author A
UPDATE wp_posts SET post_author = 'new-author-id' WHERE post_author = 'old-author-id';

# Delete Revision
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'

# Delete Post Meta
DELETE FROM wp_postmeta WHERE meta_key = 'your-meta-key';

# Export all Comment Emails with no Duplicate
SELECT DISTINCT comment_author_email FROM wp_comments;

# Delete all Pingbacks
DELETE FROM wp_comments WHERE comment_type = 'pingback';

# Delete all Spam Comments
DELETE FROM wp_comments WHERE comment_approved = 'spam';
#     * 0 = Comment Awaiting Moderation
#     * 1 = Approved Comment
#     * spam = Comment marked as Spam

# Identify Unused Tags
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;

Note: If this is your first time adding code snippets in WordPress, then please refer to our guide on how to properly add code snippets in WordPress, so you don’t accidentally break your site.

If you liked this code snippet, please consider checking out our other articles on the site like: 11 best WordPress quiz plugins and how to create stunning WordPress optin forms.