Use this command to update site url from mysql prompt. Make sure you have the necessary permissions and access. More details can be found in the link below.
UPDATE wp_options SET option_value = replace(option_value, 'oldurl.com', 'newurl.com') WHERE option_name = 'home' OR option_name = 'siteurl';UPDATE wp_posts SET guid = replace(guid, 'oldurl.com','newurl.com');UPDATE wp_posts SET post_content = replace(post_content, 'oldurl.com', 'newurl.com'); UPDATE wp_postmeta SET meta_value = replace(meta_value,'oldurl.com','newurl.com');