STDDEV_SAMP
description
Syntax
STDDEV_SAMP(expr)
返回expr表达式的样本标准差
example
MySQL > select stddev_samp(scan_rows) from log_statis group by datetime;
+--------------------------+
| stddev_samp(`scan_rows`) |
+--------------------------+
| 2.372044195280762 |
+--------------------------+keywords
STDDEV_SAMP,STDDEV,SAMP