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

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

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