STDDEV_POP Function | Standard Deviation Function | Teradata Vantage - 17.10 - STDDEV_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 standard deviation for the non-null 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 Vantageā„¢ - Time Series Tables and Operations, B035-1208.

For the STDDEV_POP window function that performs a group, cumulative, or moving computation, see Window Aggregate Functions.

Standard Deviation

The standard deviation is the second moment of a population. For a population, it is a measure of dispersion from the mean of that population.

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

Computation

STANDARD DEVIATION OF A SAMPLE is valid only for numeric data.

Nulls are not included in the result computation.

When there are no non-null data points in the population, then STDDEV_POP returns NULL.

Division by zero results in NULL rather than an error.