update table set turns = turns+ x;
  update table set turns = max where turns > max;
  commit;

##</code><code>##

  update table set
    last_login = sysdate(),
    turns_left = ( $turns_per_day * datediff( sysdate(), last_login ))
  where user_id = ?

##</code><code>##

  update table set
    turns_left = ( $turns_per_day * datediff( sysdate(), last_login )),
    last_login = sysdate()
  where user_id = ?