like this

<?php
$sql="select a.Anggota_ID id,a.Nama_Anggota nama, count(a.Anggota_ID)c from anggota a, assign a2, bahagian b where a.anggota_id=a2.Anggota_ID and a.bahagian_id=b.bahagian_id
group by a.Anggota_ID";
$res=query($sql); //only make query and return result
$s="<table>";
while($row=fetch($res))
{
    $title="<td rowspan='{$row['c']}'>$row[Nama_Anggota]</td>";
//learn what is 'rowspan'
    $sql="select bahagian from assign a, bahagian b where a.anggota_id=$row[Anggota_ID] and a.bahagian_id=b.bahagian_id";
    $res2=query($sql);
    while($row2=fetch($res2))
    {
        $s.="<tr>".$title;$title='';
//for every start we need to put the title
        $s.="<td>{$res2['bahagian']}</td>";
        $s.="</tr>";

    }//while($row2=fetch($res2))

}//while($row=fetch($res))
$s.="</table>";
echo $s;$s='';