log2

description

Syntax

DOUBLE log2(DOUBLE x) 返回以2为底的x的自然对数.

example

mysql> select log2(1);
+-----------+
| log2(1.0) |
+-----------+
|         0 |
+-----------+
mysql> select log2(2);
+-----------+
| log2(2.0) |
+-----------+
|         1 |
+-----------+
mysql> select log2(10);
+--------------------+
| log2(10.0)         |
+--------------------+
| 3.3219280948873622 |
+--------------------+

keywords

LOG2