VAR_POP Function | Teradata Vantage - 17.10 - VAR_POP - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - 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 population variance for the data points in value_expression.

This function returns the REAL data type.

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

Variance

The variance of a population is a measure of dispersion from the mean of that population.

Do not use VAR_POP unless the data points you are processing are the complete population.

Computation

When the population has no non-null data points, VAR_POP returns NULL.

Division by zero results in NULL rather than an error.