LN Function - SQL

Overview

The LN function in SQL returns the natural logarithm of a given numeric expression. It is useful for logarithmic calculations where the base is e (approximately 2.718).

Example:

SELECT LN(2.718281828459045)

Syntax:

SELECT LN(numeric_expression)

numeric_expression is the numeric value for which you want to calculate the natural logarithm.

Sample Data:

    
            first_name
            vacation_days
        
            Frank
            5
        
            Jane
            2
        
            Ashley
            3
        
            Glenn
            -3
        
            Kelly
            2
        
            Richard
            -7
        
            George
            2
        
            Kyle
            1
        
            James
            -2
        
            Gustavo
            -10

first_name	vacation_days
Frank	5
Jane	2
Ashley	3
Glenn	-3
Kelly	2
Richard	-7
George	2
Kyle	1
James	-2
Gustavo	-10

Example: Hard-coded value

In this example, we are returning the natural logarithm of 2.718281828459045 with the final output being 1.

Example: Query without the WHERE Statement

In this example, we are returning the natural logarithm of the values in the vacation_days column.

Example: Query with the WHERE Statement

In this example, we are returning the natural logarithm of the values in the vacation_days column where the first_name equals ‘Kelly.’