如何从php，mysql中的单列获取多个值的数据

I want to fetch data for multiple value from single column, but only the last one (price = 399) is visible on page.

I am using this code, please help I want to fetch data for all 3 prices.

<a href="show_products.php?price=149&price=299&price=399">

    if (isset($_GET['price']) && $_GET['price']<>"") 
{ 
$productprice= $_GET['price'];
 $productprice_result=mysql_query("select * from products where price=$productprice"); 

while($productprice_rows=mysql_fetch_array($productprice_result)){ 

$productid=$productprice_rows["product_id"];
 $productsql=$productsql. "and price=$productprice "; 
}

try it