log2

description

Syntax

DOUBLE log2(DOUBLE x) 返回以2为底的x的自然对数.

example

1. mysql> select log2(1);
2. +-----------+
3. | log2(1.0) |
4. +-----------+
5. |         0 |
6. +-----------+
7. mysql> select log2(2);
8. +-----------+
9. | log2(2.0) |
10. +-----------+
11. |         1 |
12. +-----------+
13. mysql> select log2(10);
14. +--------------------+
15. | log2(10.0)         |
16. +--------------------+
17. | 3.3219280948873622 |
18. +--------------------+

keywords

1. LOG2