mysql> SELECT CONCAT(SUM(traffic)/(1024*1024*1024),' GiB') AS traffic,   CONCAT(SUM(hits)/1000000,' M') AS hits   FROM apache_hits WHERE YEAR(datum)=2011;
+--------------+-----------+
| traffic      | hits      |
+--------------+-----------+
| 403.5372 GiB | 43.5687 M | 
+--------------+-----------+
1 row in set (1.35 sec)