LN

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Overview

LN() will return the exponential value of its argument, which is recognized as the input parameter’s natural logarithm.

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Syntax

The syntax of the LN() function is described as follows.

LN (x)

x:  A positive or a negative number (or an expression that evaluates to a number).

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Examples

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Case #1: Basic LN() function

The example below shows that LN() function will return the natural logarithm of the number 7,87653.

SELECT LN(7.87653);

The final result is as follows.

+-------------+
| f           |
+-------------+
| 2.0638874   |
+-------------+

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Case #2: Using LN() Function With a Table

In the following example, we will combine LN() function with CREATE TABLE statement. Therefore we can obtain natural logarithmic values of a specific column.

1. Create a new table named LNTable containing the initValue column with an integer value.

CREATE TABLE LNtable(initValue int);
INSERT INTO LNtable(initValue)
VALUES (75), (18), (28);

2. Run the following query to get the logarithm output of the column:

SELECT * ,LN(initValue) AS lnValue FROM LNtable;

3. It will return the initial value with its natural logarithm value.

• initValue column with the initial integer values.

• lnValue column with the natural logarithm values.

+------------+---------------------------+
| initValue  | lnValue                   |
+------------+---------------------------+
| 75         | 4.31748811353631          |
| 18         | 2.8903717578961645        |
| 28         | 3.332204510175204         |
+------------+---------------------------+