mysql - Codeigniter: unable to show result in desc order with count -


i have 2 tables,

instructions  ------------- instruction_id  int(11)   primary key (auto_increment) instruction      text user_id          int(11)    foreign key   instrunctionlike ----------------- instrunction_likeid  int(11)  primary key (auto_increment) instrunction_id      int(11)  foreign key

in instructions & in instrunctionlike table there many rows, what want , likes count in desc order instrunctionlike table. eg. select*from instrunctionlike order count(instrunctionlike.instrunction_likeid)...

below tried, confuse how implement count on rows desc order. please me solve issue

//----------------------------------------------------------------------------------- public function fetch_agreed_desc_order_instruction($limit, $start) {       $this->load->database();       $this->db->limit($limit, $start);      $this->db->join('userdetails', 'userdetails.user_id = instructions.user_id');        $this->db->join('instrunctionlike', 'instrunctionlike.instrunction_id = instructions.instruction_id');      $this->db->order_by('instrunctionlike.instrunction_id', 'desc');      $this->db->group_by("instrunctionlike.instrunction_id");       $query = $this->db->get("instructions");      if ($query->num_rows() > 0) {         foreach ($query->result() $row) {             $data[] = $row;         }         return $data;     }     return false;   }

sample output:

             instructions                likes              .............                78              .............                66              .............                56              .............                34              .............                12              .............                 1              .............                 1             .............                  0

whlie want group instrunction_id, don't want order that. instead want order count(instrunction_id):

$this->db->order_by('count(instrunctionlike.instrunction_id)', 'desc'); $this->db->group_by("instrunctionlike.instrunction_id");

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