# SQL LN() function

## LN() function

SQL LN() function returns the natural logarithm of n, where n is greater than 0 and its base is a number equal to approximately 2.71828183.

**Syntax:**

LN(expression)

**DB2, PostgreSQL, and Oracle**

All of above platforms support the SQL syntax of LN().

**MySQL and SQL Server**

If you are using above two platforms, use LOG() instead.

**Parameters:**

Name |
Description |
---|---|

expression | An expression which is a float or can be converted to a float. |

## SQL LN() function: Pictorial presentation

**Example:**

To get the natural logarithm of 65 from the DUAL table, the following SQL statement can be used:

```
SELECT LN(65) "natural_log of 65"
FROM dual;
```

Output:

natural_log of 65 ----------------- 4.17438727

Note: Outputs of the said SQL statement shown here is taken by using Oracle Database 10g Express Edition.

Here is a slide presentation which covers the SQL arithmetic functions.

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