STDDEV_SAMP Function | Standard Deviation Function | Teradata Vantage - 17.10 - STDDEV_SAMP - 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 sample 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_SAMP 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 distribution. For a sample, it is a measure of dispersion from the mean of that sample. The computation is more conservative for the population standard deviation to minimize the effect of outliers on the computed value.

Computation

Division by zero results in NULL rather than an error.

When there are fewer than two non-null data points in the sample used for the computation, then STDDEV_SAMP returns NULL.