[英]Subtract the two sum in foreach loop for datatable
我怎樣才能從數據庫中減去foreach循環中的兩個獲取數據總和,以便使用codeigniter在datatable中顯示到目前為止這就是我所做的...
function fetch_user(){
$fetch_data = $this->point_m->make_datatables();
$data = array();
foreach ($fetch_data as $row)
{
$sub_array = array();
$sub_array[] = $row->idnumber;
$sub_array[] = $row->firstname;
$sub_array[] = $row->middlename;
$sub_array[] = $row->lastname;
$sub_array[] = $row->course_id;
$sub_array[] = $row->schoolyear;
$sub_array[] = $row->semester;
$sub_array[] = $row->point;
$sub_array[] = $row->redeem;
$data[] = $sub_array;
}
$output = array(
"draw" => $_POST['draw'],
"recordsTotal" => $this->point_m->get_all_data(),
"recordsFiltered" => $this->point_m->get_filtered_data(),
"data" => $data
);
echo json_encode($output);
}
$ row-> point和$ row-> redeem已經相加,現在我想知道我是否可以減去這兩個($ row-> point,$ row-> redeem)以及如何...
這是我的疑問
$query = $this->db
->select("students.id,idnumber, firstname, middlename, lastname, course_id, schoolyear, semester, sum(point) as 'point', sum(redeem) as 'redeem'")
->distinct()
->from('students')
->join('section_student', 'students.id = section_student.student_id', 'LEFT')
->group_by('idnumber, firstname, middlename, lastname, course_id, schoolyear, semester')
->where('schoolyear','schoolyear')
->where('semester','semester');
$query = $this->db->get();
return $query->result();
我只是添加另一個sub_array並減去這兩個
$sub_array[] = $row->point - $row->redeem;
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