VAR_SAMP,VARIANCE_SAMP

description

Syntax

VAR_SAMP(expr)

返回expr表达式的样本方差

example

1. MySQL > select var_samp(scan_rows) from log_statis group by datetime;
2. +-----------------------+
3. | var_samp(`scan_rows`) |
4. +-----------------------+
5. |    5.6227132145741789 |
6. +-----------------------+

keywords

VAR_SAMP,VARIANCE_SAMP,VAR,SAMP,VARIANCE