从Codeigniter中的多个表连接后无法获取数据

Question

I want to get data from two tables, the second table is for rating so i want to get rating of products simultaneosly. Below code is not working for me if i change

$this->db->select('dg_products. ',' , AVG( dg_rating.rating ) As averageRating');

to

$this->db->select('*');

then it is working. Please help to sort out my issue.

public function get_rating()
    {
        $this->db->select('dg_products.*','*, AVG(`dg_rating.rating`) As averageRating');
        $this->db->from('dg_products');
        $this->db->join('dg_rating', 'dg_products.id = dg_rating.product_id','left');
        $this->db->where('dg_products.is_featured_prod','1');
        $this->db->group_by("dg_products.id");
        $query = $this->db->get();   
        $result = $query->result();
        return $result; 
  }

Answer 1

Try it like this :

$this->db->select('dg_products.*, AVG(`dg_rating.rating`) As averageRating');

you just have an unneeded quotes in there.