17.05 - How Vantage Resolves Multiple Grouping Sets Specifications - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Published
January 2021
Language
English (United States)
Last Update
2021-01-22
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Vantage resolves multiple grouping sets specifications by concatenating pairwise the individual elements of the different sets. For information about grouping sets specifications, see:

This is trivial in the case of a simple grouping specification because it is a set containing only one element. However, when applied to more complicated specifications that contain multiple grouping specification elements, the resolution is more complicated.

For example, the following two GROUP BY clauses are semantically identical:

     GROUP BY GROUPING SETS ((A,B), (C)), GROUPING SETS ((X,Y),())
     GROUP BY GROUPING SETS ((A,B,X,Y),(A,B),(C,X,Y),(C))