Update site url in wp_options:
UPDATE wp_options
SET option_value = replace(option_value, 'http://www.oldurl', 'http://www.newurl')
WHERE option_name = 'home' OR option_name = 'siteurl';
Update guid:
UPDATE wp_posts SET guid = replace(guid, 'http://www.oldurl','http://www.newurl');
Update all urls in post content:
UPDATE wp_posts
SET post_content = replace(post_content, 'http://www.oldurl', 'http://www.newurl');
Update all urls in meta fields:
UPDATE wp_postmeta
SET meta_value = replace(meta_value,'http://www.oldurl','http://www.newurl');