VAR_SAMP,VARIANCE_SAMP
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 |
+-----------------------+keywords
VAR_SAMP,VARIANCE_SAMP,VAR,SAMP,VARIANCE