ORM Query with expression and Keeping the name of the table as singular

http://localhost/kohana/index.php/guide/database/query/builder#aggregate-functions

Table Schema
============
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";

CREATE TABLE IF NOT EXISTS `example` (
  `Name` varchar(100) NOT NULL,
  `id` int(11) NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=49 DEFAULT CHARSET=latin1;


INSERT INTO `example` (`Name`, `id`) VALUES
('Robeul', 26),
('Asma', 27),
('Joy', 28),
('Tanvir', 29),
('Dilir', 48);


ALTER TABLE `example`
  ADD PRIMARY KEY (`id`);
ALTER TABLE `example`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT,AUTO_INCREMENT=49;

----------------

Model

=====

<?php defined('SYSPATH') or die('No Direct Access');

class Model_Example extends ORM

{

protected $_table_name = 'example';

} 

Controller

==========

 public function action_getMax()

  {

    $exampleTable=ORM::factory('example');

    $m=$exampleTable->select(array(DB::expr('MAX(id)'), 'max_id'))->find();

    echo $m->max_id;

  }

Output: 48

Note:

Generally, if the name of the model class is 'Model_Example', there needs to be a table named 'examples' in your database. But, since we chose to name the table as 'example' (we skipped the 's'), we need to make a declaration:  protected $_table_name = 'example';