VAR_SAMP Function Syntax | Teradata Vantage - 17.10 - VAR_SAMP - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1145-171K
Language
English (United States)

Returns the sample variance for the data points in value_expression.

To invoke the time series version of this function, use the GROUP BY TIME clause. For more information, see Teradata Vantage™ - Time Series Tables and Operations, B035-1208.

Variance

The variance of a sample is a measure of dispersion from the mean of that sample. It is the square of the sample standard deviation.

The computation is more conservative than that for the population standard deviation to minimize the effect of outliers on the computed value.

Computation

When the sample used for the computation has fewer than two non-null data points, 
VAR_SAMP returns NULL.

Division by zero results in NULL rather than an error.