ln, dlog1, log

Description

Computes the natural (base e) logarithm of a number.

Syntax

ln(arg)
log(arg)
dlog1(arg)

Parameters

  • arg: the value whose logarithm you want to calculate. Only the DOUBLE data type is supported.

NOTE

CelerData returns NULL if arg is specified as a negative or 0.

Return value

Returns a value of the DOUBLE data type.

Example

Example 1: Calculate the natural logarithm of 3.

mysql> select ln(3);
+--------------------+
| ln(3)              |
+--------------------+
| 1.0986122886681098 |
+--------------------+
1 row in set (0.00 sec)

mysql> select dlog1(3);
+--------------------+
| dlog1(3)              |
+--------------------+
| 1.0986122886681098 |
+--------------------+
1 row in set (0.00 sec)

mysql> select log(3);
+--------------------+
| log(3)              |
+--------------------+
| 1.0986122886681098 |
+--------------------+
1 row in set (0.00 sec)
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