16.20 - How GROUP BY Affects Report Breaks - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
16.20
Release Date
March 2019
Content Type
Programming Reference
Publication ID
B035-1145-162K
Language
English (United States)

STDDEV_POP operates differently depending on whether there is a GROUP BY clause in the SELECT statement.

IF the query … THEN STDDEV_POP is reported for …
specifies a GROUP BY clause each individual group.
does not specify a GROUP BY clause all the rows in the sample.