notification ajax php mysql

1$sql = "update tbl_noti set status = 'read'";
2       $result = $conn->query($sql);
3       $row = $result->fetch_assoc();
4       $count = $result->num_rows;
5       echo $count;
6       $conn->close();
7

1<script type="text/javascript">
2
3$(document).ready(function(){
4$("#datacount").load("select.php");
5setInterval(function(){
6$("#datacount").load('select.php')
7}, 20000);
8 });
9
10</script>
11

1$sql = "update tbl_noti set status = 'read'";
2       $result = $conn->query($sql);
3       $row = $result->fetch_assoc();
4       $count = $result->num_rows;
5       echo $count;
6       $conn->close();