error joining tables in php mysql - php

Question

I want to join tables in php mysql. Here's my code:
public public function getResponInfo($kode_laporan)
{
$this->db->select('*');
$this->db->from('laporan l, respon_user ru, respon r');
$this->db->join('admin a', 'a.id_admin = r.id_admin', 'left');
$this->db->join('respon_user ru', 'ru.kode_laporan = r.kode_laporan', 'left');
$this->db->join('user u', 'u.id = ru.id_pengirim', 'left');
$this->db->where("r.kode_laporan = '". $kode_laporan."'");
//$this->db->order_by('r.tanggal', 'asc');
return $this->db->get();
}
And it got error like this
All I want to do is to display
'isi_respon' and 'tanggal' from respon table, 'nama_opd' from admin table, 'isi_respon' and 'tanggal' from respon_user table, 'nama' from user table.
Then, I want to order them by "tanggal" from respon and respon_user tables.
Both tables respon and respon_user have kode_laporan from laporan table.
Is it possible to do that? thank you for your help
updated
I think all the codes that u've given to me are working. but i got another problem to display them through the controller and view files.
here's my controller code:
public function detailLaporan($kode_laporan)
{
$data['page']='detaillaporan';
$data['laporan'] = $this->Home_model->getLapDetail($kode_laporan);
$data['id'] = $this->session->userdata('id');
$data['respon'] = $this->Home_model->getResponInfo($kode_laporan)->result();
$data['rsp'] = $this->Home_model->getResponInfo($kode_laporan)->num_rows();
$data['kode_laporan'] = $this->session->set_userdata('kode_laporan');
$this->load->view('home/master', $data);
}
view:
if($rsp > 0){
foreach ($respon as $r) {
echo $r['tanggal'];
echo $r['nama'];
/*i want to display 'nama' or 'nama_opd',
it depends on whether it belongs to 'respon' or 'respon_user' table*/
$r['isi_respon'];
}
}

Answer 1

Please try the below code
$this->db->select('r.isi_respon, r.tanggal as respon_tanggal, a.nama_opd, ru.isi_respon as respon_user_isi_respon, ru.tanggal as response_user_tanggal, u.nama');
$this->db->from('respon r');
$this->db->join('admin a', 'a.id_admin = r.id_admin', 'left');
$this->db->join('respon_user ru', 'ru.kode_laporan = r.kode_laporan', 'left');
$this->db->join('user u', 'u.id = ru.id_pengirim', 'left');
$this->db->where("r.kode_laporan = '". $kode_laporan."'");
$this->db->order_by('r.tanggal, ru.tanggal', 'asc');
return $this->db->get();

Answer 2

$this->db->select('l.*,ru.*,r.*,a.*,u.*');
$this->db->from('laporan l');
$this->db->join('admin a', 'a.id_admin = r.id_admin', 'left');
$this->db->join('respon_user ru', 'ru.kode_laporan = r.kode_laporan', 'left');
$this->db->join('user u', 'u.id = ru.id_pengirim', 'left');
$this->db->where("r.kode_laporan = '". $kode_laporan."'");
$this->db->order_by('r.tanggal', 'asc');
return $this->db->get();