deleting rows in a while reading loop in the same table

[Pierre-Yves Michaud]

I want to be sure that the following is correct

$sqlov = "select * from ordres_ventes ORDER BY prix ASC";
$reqov = mysql_query($sqlov) or die('Erreur SQL !');
while($data_ov = mysql_fetch_array($reqov))
{
if (xxxx)
mysql_query("DELETE FROM ordres_ventes WHERE id='$id_offre_vente'");}
else
mysql_query("Update ordres_ventes Set nb='$reste_qte_a_vendre' WHERE id='$id_offre_vente'");
}

can i get troubles deleting rows in the same table that i am currently reading?

Thanks in advance for the answers
Pierre-Yves