LN

    Syntax

    LN( number )
    

    Description

    Returns the natural logarithm of the number number. Returns 'NULL' if the number is less than or equal to 0.

    Argument types:

    • numberFractional number | Integer

    Return type: Fractional number

    Examples

    LN(1) = 0.0
    
    LN(EXP(2)) = 2.0
    

    Data source support

    ClickHouse 19.13, Microsoft SQL Server 2017 (14.0), MySQL 5.6, PostgreSQL 9.3.