我如何通过串行方式从主页看到数据

I have a mysql table "catagory". column like that catagory_id,catagory_name and some values.I want to see id serially and product from main page Example:

**Product Catagory**
Hardware
Software
Others

$get_categories_sql = mysql_query("SELECT catagory_id,catagory_name FROM catagory ORDER BY catagory_id ASC");
while($get_categories = mysql_fetch_assoc($get_categories_sql))
{ 
echo $get_categories['catagory_id']."<br>";
}

First, Use SELECT query to get data from database then to display it serially(one after another), just add <br>,