STDDEV_SAMP

STDDEV_SAMP

描述

语法

STDDEV_SAMP(expr)

返回expr表达式的样本标准差

举例

MySQL > select stddev_samp(scan_rows) from log_statis group by datetime;
+--------------------------+
| stddev_samp(`scan_rows`) |
+--------------------------+
|        2.372044195280762 |
+--------------------------+

keywords

STDDEV_SAMP,STDDEV,SAMP