/*
mysql> select LOG10(10);
+-----------+
| LOG10(10) |
+-----------+
| 1 |
+-----------+
1 row in set (0.00 sec)
mysql> select LOG2(8);
+---------+
| LOG2(8) |
+---------+
| 3 |
+---------+
1 row in set (0.00 sec)
*/
select LOG10(10);
select LOG2(8);