Question

description

Syntax

VAR_SAMP(expr)

返回expr表达式的样本方差

example

MySQL > select var_samp(scan_rows) from log_statis group by datetime;
+-----------------------+
| var_samp(`scan_rows`) |
+-----------------------+
|    5.6227132145741789 |
+-----------------------+

keyword

VAR_SAMP,VARIANCE_SAMP,VAR,SAMP,VARIANCE