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UPDATE wp_options SET option_value = replace(option_value, 'http://www.old.com', 'http://www.new.com') WHERE option_name = 'home' OR option_name = 'siteurl';

 

UPDATE wp_posts SET guid = replace(guid, 'http://www.old.com','http://www.new.com');

 

UPDATE wp_posts SET post_content = replace(post_content, 'http://www.old.com', 'http://www.new.com');