преобразование MySQL-запроса в синтаксис Codeigniter

У меня есть проблема с преобразованием MYSQL-запроса в синтаксис CI.

Этот мой синтаксис MySQL:

select a.pbj_name as 'NAMA PERUSAHAAN', count(a.id_pbj) as 'JUMLAH PAKET', group_concat(c.paket_kode) as 'PILIHAN PAKET' from jed_pbj a left join jed_paket_pbj b on a.id_pbj=b.id_pbj left join jed_paket c on b.id_paket=c.id_paket group by a.id_pbj 

Проверьте класс Active Record в Codeigniter,

 $this->db->select("a.pbj_name as 'NAMA PERUSAHAAN', count(a.id_pbj) as 'JUMLAH PAKET', group_concat(c.paket_kode) as 'PILIHAN PAKET'"); $this->db->from('jed_pbj a'); $this->db->join('jed_paket_pbj b', 'a.id_pbj=b.id_pbj', 'left'); $this->db->join('jed_paket c', 'b.id_paket=c.id_paket', 'left'); $this->db->group_by("a.id_pbj"); $this->db->get();