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#301 Redirects for .htaccess

#Redirect a single page:
Redirect 301 /pagename.php http://www.domain.com/pagename.html

#Redirect an entire site:
Redirect 301 / http://www.domain.com/

#Redirect an entire site to a sub folder
Redirect 301 / http://www.domain.com/subfolder/

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# 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;

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

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

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

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

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# 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'

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

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

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# 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';