Question

我在下面有四张表

第二个是 retration 表

filds st_name，Adhar no，address，exam_level

trans temp table 雇用学生adhar no。是否有付款的详细信息领域是 id，student_id，reference_no，sub_merchant_id，amount，student_name，mobile_no，father_name，{{ 1}}，clas，uid

最后一个是交易成功表我习惯了加入命令

exam_lavel

在stud_trans我有两种付款方式现金和成功我想要现金模式，这取决于附加图像exam_level

Answer 1

尝试在标记的代码中进行一些更改。

$this->db->select('*');
$this->db->from('student_login');
$this->db->where('stauts', 'active');

$this->db->join('student_registration', 'student_login.student_id = 
    student_registration.id', 'left');
$this->db->join('stud_trans_temp', 
    'stud_trans_temp.student_id=student_registration.id', 'left');
$this->db->join('stud_trans', 
    'stud_trans.referenceno=stud_trans_temp.reference_no', 'left');
$this->db->where('student_login.status', 'active'); 
$query = $this->db->get();
return $query->result_array();

Answer 2

清理一些代码

//might need to specify what you want since you have a lot of joins ex. student_registration.id as reg_id
$this->db->select('*');
//can make aliases
$this->db->join('student_registration sr', 'sl.student_id = 
sr.id', 'left');
$this->db->join('stud_trans_temp', 
'stud_trans_temp.student_id = sr.id', 'left');
$this->db->join('stud_trans', 
'stud_trans.referenceno=stud_trans_temp.reference_no', 'left');
$this->db->where('stauts', 'active');
$this->db->where('student_login.status', 'active'); 
//can make this one line or chain them all together
return $this->db->get('student_login sl')->result_array();

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