text: INSERT INTO "#__update_sites" ("name", "type", "location", "enabled") VALUES
  ('Joomla! Update Component Update Site', 'extension', 'http://update.joomla.org/core/extensions/com_joomlaupdate.xml', 1);
  
  INSERT INTO "#__update_sites_extensions" ("update_site_id", "extension_id") VALUES
  ((SELECT "update_site_id" FROM "#__update_sites" WHERE "name" = 'Joomla! Update Component Update Site'), (SELECT "extension_id" FROM "#__extensions" WHERE "name" = 'com_joomlaupdate'));
  