UPDATE wp_options SET option_value = REPLACE(option_value, 'old.com', 'new.com') WHERE option_name = 'home' OR option_name = 'siteurl';
UPDATE wp_posts SET guid = REPLACE(guid, 'old.com','new.com');
UPDATE wp_posts SET post_content = REPLACE(post_content, 'old.com', 'new.com');