LOG2

Syntax

LOG2(X)

Description

Returns the base-2 logarithm of X.

Examples

SELECT LOG2(4398046511104);
+---------------------+
| LOG2(4398046511104) |
+---------------------+
|                  42 |
+---------------------+

SELECT LOG2(65536);
+-------------+
| LOG2(65536) |
+-------------+
|          16 |
+-------------+

SELECT LOG2(-100);
+------------+
| LOG2(-100) |
+------------+
|       NULL |
+------------+

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https://mariadb.com/kb/en/log2/