LN

Syntax

LN(X)

Description

Returns the natural logarithm of X; that is, the base-e logarithm of X. If X is less than or equal to 0, or NULL, then NULL is returned.

The inverse of this function is EXP().

Examples

SELECT LN(2); +-------------------+ | LN(2) | +-------------------+ | 0.693147180559945 | +-------------------+  SELECT LN(-2); +--------+ | LN(-2) | +--------+ | NULL | +--------+

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