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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