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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