<?php

  $fields = drupal_schema_fields_sql('menu_router');
  $table_name = db_query_temporary('SELECT * FROM {menu_router}');
db_delete($table_name)->condition('path', 'admin')->execute();
db_update($table_name)->expression('weight', 'weight +1')->condition('path', 'admin/config')->execute();
 

  $query = db_select('menu_router', 'new', array('fetch' => PDO::FETCH_ASSOC));
  $query->fields('new', $fields);
  $query->leftJoin($table_name, 'old', 'new.path = old.path');
  $or = db_or()
    ->isNull('old.path');
  foreach ($fields as $field) {
    $or->where("new.$field != old.$field");
  }
  $query->condition($or);
  print_r($query->execute()->fetchAll());