var_samp¶
This function is used to return the sample variance of a specified column.
Syntax¶
var_samp(col)
Parameters¶
Parameter | Mandatory | Description |
|---|---|---|
col | Yes | Columns with a data type of numeric. If the values are of any other type, NULL is returned. |
Return Values¶
The return value is of the DOUBLE type.
Example Code¶
Calculates the sample variance of all offering inventories (items). An example command is as follows:
select var_samp(items) from warehouse;
The command output is as follows:
_c0 294.342355
When used with group by, it groups all offerings by warehouse (warehourseId) and returns the sample variance of the offering inventory (items) in the same group. An example command is as follows:
select warehourseId, var_samp(items) from warehourse group by warehourseId;
The command output is as follows:
warehouseId _c1 city1 18.23124 city2 16.23344 city3 11.43425