I'm in big trouble in codeigniter.

I want to use FIND_IN_SET mysql function in codeigniter join() function. But problem is codeigniter consider FIND_IN_SET as a field name.

Please check below code:

$this->db->select("gcpo.promotional_offer_id,gcpo.promotional_offer_name,gcpo.promotional_offer_code,gcpo.promotional_offer_type,gcpo.promotional_offer_discount,gcpo.promotional_offer_min_amount,gcpo.promotional_offer_uses_per_offer,gcpo.promotional_offer_start_date,gcpo.promotional_offer_end_date,name,gcpo.promotional_offer_is_active,gcpo.promotional_offer_added_date,count(gcopo.promotional_offer_code) as cntP");
    $this->db->from("promotional_offer gcpo");
    $this->db->join("customer_groups", "FIND_IN_SET(id,promotional_offer_customer_group) > 0");
    $this->db->join("order_promotional_offer gcopo", "gcopo.promotional_offer_code=gcpo.promotional_offer_code","left");
    $this->db->group_by('gcpo.promotional_offer_code');
    $this->db->limit($_GET['iDisplayLength'], $start);
    $this->db->order_by($sort_array[$_GET['iSortCol_0']], $_GET['sSortDir_0']);
    $query = $this->db->get();

In mysql query output which given by codeigniter:

SELECT `gcpo`.`promotional_offer_id`, `gcpo`.`promotional_offer_name`, `gcpo`.`promotional_offer_code`, `gcpo`.`promotional_offer_type`, `gcpo`.`promotional_offer_discount`, `gcpo`.`promotional_offer_min_amount`, `gcpo`.`promotional_offer_uses_per_offer`, `gcpo`.`promotional_offer_start_date`, `gcpo`.`promotional_offer_end_date`, `name`, `gcpo`.`promotional_offer_is_active`, `gcpo`.`promotional_offer_added_date`, count(gcopo.promotional_offer_code) as cntP FROM (`gc_promotional_offer` gcpo) JOIN `gc_customer_groups` ON `FIND_IN_SET`(`id,promotional_offer_customer_group)` > 0 LEFT JOIN `gc_order_promotional_offer` gcopo ON `gcopo`.`promotional_offer_code`=`gcpo`.`promotional_offer_code` GROUP BY `gcpo`.`promotional_offer_code` ORDER BY `gcpo`.`promotional_offer_added_date` desc LIMIT 10

now please find the find_in_set function in mysql query you will find like field name that consider by codeigniter .