Caps

Is it allowed to have more than one SQL statements (SELECT and DELETE) in one mysql_query() method? Or must you have two mysql_query methods to it? If the user posts something you want to set into your database, will they could finished the insert statement and execute a drop and delete statement in the same mysql_query method? Like: site.php?id = .... $id = "'; DELETE FROM users WHERE id = 1" //user changed variable mysql_query("SELECT navn FROM users WHERE id = '$id'") The above code does not work, but I hope you got the idea of it. Is it possible in any way?