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