CodeIgniter неправильно применяет кавычки идентификатора в выражениях concat_ws () ⇐ Php

[Anonymous]

Получение ошибки, когда я попробовал это:
$ci =& get_instance();
$ci->db->select("CONCAT_WS(' ',users.name_first,users.name_last) AS user_name,CONCAT_WS(' ',advertisers.name_first,advertisers.name_last) AS advertiser_name,image,advertiser_reviews.last_updated");

$ci->db->join('users', 'users.id = advertiser_reviews.user_id');
$ci->db->join('advertisers', 'advertisers.id = advertiser_reviews.advertiser_id');
$ci->db->order_by('advertiser_reviews.id','desc');
$ci->db->limit(1);
$query = $ci->db->get('advertiser_reviews');

ошибка следующим образом:
Error Number: 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM (`hc_advertiser_reviews`) JOIN `hc_users` ON `hc_users`.`id` = `hc_advertis' at line 2

SELECT CONCAT_WS(' ', `hc_users`.`name_first`, `hc_users`.`name_last)` AS user_name,
CONCAT_WS(' ', `hc_advertisers`.`name_first`, `hc_advertisers`.`name_last)` AS advertiser_name,
`image`,
`hc_advertiser_reviews`.`last_updated`
FROM (`hc_advertiser_reviews`)
JOIN `hc_users` ON `hc_users`.`id` = `hc_advertiser_reviews`.`user_id`
JOIN `hc_advertisers` ON `hc_advertisers`.`id` = `hc_advertiser_reviews`.`advertiser_id`
ORDER BY `hc_advertiser_reviews`.`id` desc LIMIT 1


Подробнее здесь: https://stackoverflow.com/questions/977 ... -expressio