Ajax DataTable Sorting - json

Question

Is it possible to sorting based on data inside while loop? without using the sql order by.
But also after i select which column, it will sort desc or asc based on data inside not sort by database column and limit it only 10 every page
lookup.php
$draw = $_POST['draw'];
$row = $_POST['start'];
$rowperpage = $_POST['length']; // Rows display per page
$columnIndex = $_POST['order'][0]['column']; // Column index
$columnName = $_POST['columns'][$columnIndex]['data']; // Column name
$columnSortOrder = $_POST['order'][0]['dir']; // asc or desc
$searchValue = $_POST['search']['value']; // Search value
## Custom Field value
$searchByName = $_POST['searchByName'];
$searchByGender = $_POST['searchByGender'];
$sel = $con->query("SELECT * FROM a, b WHERE a.nrek=b.nrek GROUP BY a.name");
$records = $con->num_rows();
$totalRecords = $records;
## Total number of records with filtering
$sel = $con-query("SELECT * FROM a, b WHERE a.nrek=b.nrek AND 1 ".$searchQuery."GROUP BY a.name");
$records = $con->num_rwos();
$totalRecordwithFilter = $records;
$empQuery = $con->query("SELECT * FROM a, b, c WHERE a.nrek=b.nrek AND a.kode=c.kode AND a.kode='3' GROUP BY a.nrek ORDER BY ".$columnName." ".$columnSortOrder." limit ".$row.",".$rowperpage");
while ($row1 = $empquery->fetch_array())
{
$querybalance2 = $con->query("SELECT SUM(b.balance) as balance FROM a JOIN a ON a.nrek= b.nrek WHERE a.kode= '$row1[kode]' AND b.period='$_SESSION[lastperiod]'");
$querybalance2 = $con->query("SELECT SUM(b.balance) as balance FROM a JOIN a ON a.nrek= b.nrek WHERE a.kode= '$row1[kode]' AND b.period='$_SESSION[newperiod]'");
$balance2 = $querybalance2->fetch_array();
$balance1 = $querybalance1->fetch_array();
$data[] = array(
"arek"=>$row1[nrek],
"balance1"=>$balance1,
"balance2"=>$balance2
);
}
$response = array(
"draw" => intval($draw),
"iTotalRecords" => $totalRecords,
"iTotalDisplayRecords" => $totalRecordwithFilter,
"aaData" => $data
);
echo json_encode($response);
Ajax.js
var dataTable = $('#empTable').DataTable
({
'processing': true,
'serverSide': true,
'serverMethod': 'post',
//'searching': false, // Remove default Search Control
'ajax':
{
'url':'lookup.php',
'data': function(data)
{
}
},
'columns':
[
{ data: 'arek' },
{ data: 'balance1', className: 'text-center' },
{ data: 'balance2', className: 'text-center' },
]
});
html.php
<table id="empTable" class="display dataTable">
<thead>
<tr>
<th>Nrek</th>
<th>Balance1</th>
<th>Balance2</th>
</tr>
</thead>
</table>
I want to limit it so the data will load and display faster. If user click on the column, datatable will sort it based on data not column. I tried but "invalid json response", because there isn't "balance2" column in database.
Need help and thank you