temporary solution

// retrieving submissions
	$post_id = $wpdb->get_results("SELECT post_id FROM " . $wpdb->prefix . "postmeta WHERE meta_key = '_form_id' and meta_value = 2");
	foreach ($post_id as $value) {
		$printf .= "<tr>";
		$sql = "SELECT meta_key, meta_value FROM " . $wpdb->prefix . "postmeta WHERE post_id = " . $value->post_id . " AND meta_key LIKE '_field_%'";
		$results = $wpdb->get_results($sql);
		$data = array(
			'1' => '',
			'2' => '',
			'3' => '',
			'4' => '',
		);
		foreach($results as $print){
			if($print->meta_key == '_field_11')
				$data['1'] = $print->meta_value;
			if($print->meta_key == '_field_30')
				$data['2'] = $print->meta_value;
			if($print->meta_key == '_field_12')
				$data['3'] = $print->meta_value;
			if($print->meta_key == '_field_8')
				$data['4'] = $print->meta_value;
		}
		foreach ($data as $print) {
			$printf .= "<td width='25%'>$print</td>";
		}
		$printf .= "</tr>";
	}