Fetching article category with several article inside the category

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SQL

PHP

So i want to show my article within the article category, it will like

category 1
..................

artikel1.1
artikel1.2
artikel1.3
more button

categori 2
..................

artikel2.1
artikel2.2
artikel2.3
more button
but after i tried it, it show only the first article for each category

category 1
...............

artikel1.1
more button

category 2
...............

artikel2.1
more button


here is my query

$sql_kategori_berita = "SELECT k.id,k.name,count(ar.id) as countartikel,";
$sql_kategori_berita .="ar.id as arid,ar.judul,ar.content, ar.kategori, ar.tanggal";
$sql_kategori_berita .=" FROM " .kategori_artikel::$nama_tabel. " k";
$sql_kategori_berita .=" LEFT JOIN " .artikel::$nama_tabel. " ar";
$sql_kategori_berita .=" ON k.id = ar.kategori";
$sql_kategori_berita .=" WHERE k.id NOT IN (1)";
$sql_kategori_berita .=" GROUP BY k.id";

$database->query($sql_kategori_berita);
$database->execute();
$nResults = $database->rowCount();
if($nResults > 0){
    $i2 = 0;
    while($row = $database->fetch()){
        if($i2 % 3 == 0 || $i2 == 0){
            echo "<div class=\"row\">";
        }

        $output ="<div class=\"col-md-4 col-sm-6 latest-news\">";
            $output .="<h3 style=\"border-bottom: 2px solid #53555c;line-height: 1.5em;margin: 30px 0;\">{$row['name']}</h3>";
            if($row['countartikel'] > 0){
                $i = 0;
                if($i <= 2){
                    $output .="<div class=\"row\">";
                        $output .="<div class=\"col-sm-12\">";
                        $output .="<div class=\"caption\"><a href=\"detail_artikel.php?i={$row['arid']}\"><b>{$row['judul']}</b></a></div>";

                        $phpdate = strtotime( $row['tanggal'] );
                        $mysqldate = date( 'F j, Y, g:i a ', $phpdate );

                        $output .="<div class=\"date\" style=\"font-size: 14px;\">{$mysqldate}</div>";

                        $content = html_entity_decode($row['content']);
                        $content = strip_tags($content);
                        $x = $content;
                        if(strlen($x)<=100)
                            $y = $x;
                        else
                            $y=substr($x,0,100) . '...';

                        $output .="<div class=\"intro\">{$y}</div>";
                        $output .="</div>";
                    $output .="</div>";

                }
                $i++;
                echo $i;
                if($row['countartikel'] > 3){
                    $output .="<div class=\"row\">";
                        $output .="<div class=\"col-sm-12\">";
                            $output .="<a href=\"list_artikel.php?i={$row['id']}\" class=\"btn\"><b>Selengkapnya &raquo</b></a>";
                        $output .="</div>";
                    $output .="</div>";
                }
            }else{
                $output .="<div class=\"row\">";
                    $output .="<div class=\"col-sm-12\">";
                    $output .="<div class=\"caption\"><b>Belum terdapat artikel...</b></div>";
                    $output .="</div>";
                $output .="</div>";
            }
        $output .="</div>";

        echo $output;

        $i2++;

        if($i2 % 3 == 0 || $i2 == $nResults){
            echo "</div> <hr/>";
        }
    }
}

so what is wrong with my code?