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VARIANCE,VAR_POP,VARIANCE_POP

Description

Returns the variance of an expression.

Syntax

VARIANCE(expr)

Return value

Returns a numerical value.

If the type of expr is DECIMAL, this function returns a DECIMAL value, or else returns a DOUBLE value.

Examples

MySQL > select variance(scan_rows)
from log_statis
group by datetime;
+-----------------------+
| variance(`scan_rows`) |
+-----------------------+
|    5.6183332881176211 |
+-----------------------+

MySQL > select var_pop(scan_rows)
from log_statis
group by datetime;
+----------------------+
| var_pop(`scan_rows`) |
+----------------------+
|   5.6230744719006163 |
+----------------------+

keyword

VARIANCE,VAR_POP,VARIANCE_POP,VAR,POP

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