Get data form multi table in Codeigniter using SQL Join

Question

Receiving error like Not unique table/alias: 'provinces' , below function is of model function , I create this function in model but getting error table/alias

function get_data_three_tbl(){

                $this->db->select('blood_donors.id, blood_donors.full_name, blood_donors.area, blood_donors.email, blood_donors.phone, provinces.province_name,districts.district_name, tehsils.tehsil_name, blood_groups.group_name');
                $this->db->from ( 'blood_donors, provinces, districts, tehsils, blood_groups ' );
                $this->db->where('blood_donors.is_deleted',1);
                $this->db->join('provinces','provinces.province_id = blood_donors.province');
                $this->db->join('districts','districts.district_id = blood_donors.district');
                $this->db->join('tehsils','tehsils.tehsil_id = blood_donors.tehsil');
                $this->db->join('blood_groups','blood_groups.id = blood_donors.blood_goup');
                $query = $this->db->get();
                if ($query->num_rows() > 0)
                return $query->result_array();
                else
                return FALSE;
    }

Answer 1

Change the from() call to

$this->db->from('blood_donors');

The join statements take care of the other tables. Having the table names in both the from and join statements is the reason for the not unique error.