Retrieve data from three table using join in CodeIgniter - php

Question

I am trying to get result from three table using CodeIgnitor active record. But I am just getting record who match with second join condition only. But I need all record..
$uid = $this->session->userdata('uid');
$codn = ['stud.uid'=>$uid,'stud.status'=>"ACTIVE"];
$liststudent = $this->db->select('stud.id,stud.studname,stud.mobile1,stud.photo,stud.totalfees,bs.title,SUM(sp.pay_in_digit) AS paidfees')
->from('students as stud')
->join('batchsetting as bs', 'bs.id = stud.bid')
->join('stud_payment as sp', 'sp.sid = stud.id')
->where($codn)
->get();
return $liststudent->result();
Here is the my query.
Concept is: I need batch title from batchsetting who's 'id = stud.bid'. and sum of paidfees from stud_payment who's 'sid=stud.id'.
But in result I am getting only those record of student who's record avail in stud_payment table.

Answer 1

Table students has not any field named as bid.So
Change
->join('batchsetting as bs', 'bs.id = stud.bid')
to
->join('batchsetting as bs', 'bs.id = stud.id')

Answer 2

Try using below code
$uid = $this->session->userdata('uid');
$liststudent = $this->db->select('stud.id,stud.studname,stud.mobile1,stud.photo,stud.totalfees,bs.title,SUM(sp.pay_in_digit) AS paidfees')
->from('students as stud')
->join('batchsetting as bs', 'bs.id = stud.id')
->join('stud_payment as sp', 'sp.sid = stud.id')
->where('stud.uid',$uid)
->where('stud.status',"ACTIVE");
return $liststudent->result();

Answer 3

Try to use a left join in your jointure. Code below :
$uid = $this->session->userdata('uid');
$codn = ['stud.uid'=>$uid,'stud.status'=>"ACTIVE"];
$liststudent = $this->db->select('stud.id,stud.studname,stud.mobile1,stud.photo,stud.totalfees,bs.title,SUM(sp.pay_in_digit) AS paidfees')
->from('students as stud')
->join('batchsetting as bs', 'bs.id = stud.bid', 'left')
->join('stud_payment as sp', 'sp.sid = stud.id', 'left')
->where($codn)
->get();
return $liststudent->result();

Answer 4

Basically ci bydefault consider inner Join query.so you need to specify left join
->join('stud_payment as sp', 'sp.sid = stud.id', 'left');

Answer 5

Use full outer join.
function full_outer_join() {
$sql = 'SELECT ' . $this->blogs . '.blog_id,comment_id,blog_title,blog_content,blog_date,comment_text,comment_date
FROM ' . $this->blogs . ' LEFT OUTER JOIN ' . $this->blog_comments . ' ON ' . $this->blog_comments . '.blog_id = ' . $this->blogs . '.blog_id
UNION
SELECT ' . $this->blogs . '.blog_id,comment_id,blog_title,blog_content,blog_date,comment_text,comment_date
FROM ' . $this->blogs . ' RIGHT OUTER JOIN ' . $this->blog_comments . ' ON ' . $this->blog_comments . '.blog_id = ' . $this->blogs . '.blog_id';
$query = $this->db->query($sql);
return $query->result();
}