LOG2()

函数说明

LOG2(X) 函数返回以 2 为底 X 的对数。

函数语法

> LOG2(X)

参数释义

示例

drop table if exists t1;
create table t1(a float, b float);
insert into t1 values(1024,17.231);
insert into t1 values(4096,23.331);
mysql>select log2(a),log2(b) from t1;
+---------+-------------------+
| log2(a) | log2(b)           |
+---------+-------------------+
|      10 | 4.106934600972237 |
|      12 | 4.544176200820541 |
+---------+-------------------+
2 rows in set (0.01 sec)