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var_samp,variance_samp

Description​

Returns the sample variance of an expression. Since v2.5.10, this function can also be used as a window function.

Syntax​

VAR_SAMP(expr)

Parameters​

expr: the expression. If it is a table column, it must evaluate to TINYINT, SMALLINT, INT, BIGINT, LARGEINT, FLOAT, DOUBLE, or DECIMAL.

Return value​

Returns a DOUBLE value.

Examples​

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