Топ-100
 
RDBMS Type: MySQL
Topic

Syntax:
LN(X)

Returns the natural logarithm of X; that is, the base-e logarithm of X.
If X is less than or equal to 0.0E0, the function returns NULL and a
warning "Invalid argument for logarithm" is reported.

URL: https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html

Example

mysql> SELECT LN(2);
-> 0.69314718055995
mysql> SELECT LN(-2);
-> NULL