UPDATE wp_options SET option_value = replace(option_value, 'OLD_SITE, 'NEW_SITE') WHERE option_name = 'home' OR option_name = 'siteurl';
UPDATE wp_posts SET guid = replace(guid, 'OLD_SITE','NEW_SITE');
UPDATE wp_posts SET post_content = replace(post_content, 'OLD_SITE', 'NEW_SITE');