ln

ln

description

Syntax

DOUBLE ln(DOUBLE x) 返回以e为底的x的自然对数.

example

mysql> select ln(1);
+---------+
| ln(1.0) |
+---------+
|       0 |
+---------+
mysql> select ln(e());
+---------+
| ln(e()) |
+---------+
|       1 |
+---------+
mysql> select ln(10);
+--------------------+
| ln(10.0)           |
+--------------------+
| 2.3025850929940459 |
+--------------------+

keywords

LN