Structure your code a bit more.
Define two variables, A,B. Then you fetch the rows and insert the values into the variables.
Psudocode:
$A = fetch($row['product_sku']);
$B = fetch($row['model_no']);
Now you should be able to echo A and B.
No output means no data retrieved from DB.
If you have output, then you can:
$mylink = "http://parrot.click.com/fs-bin/click?id=pode&offerid=".urlencode(A).urlencode(B)."&type=2&subid=0";
I'm not sure if I'm completely off target here.