17.10 - Nesting Aggregates - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Functions, Expressions, and Predicates

Advanced SQL Engine
Teradata Database
Release Number
Release Date
July 2021
Content Type
Programming Reference
Publication ID
English (United States)

Aggregate operations cannot be nested. The following aggregate is not valid and returns an error:

   AVG(MAXIMUM (Salary)) 

Although direct nesting of aggregates is not supported, nested aggregates can be evaluated using a derived table that contains the aggregates to be nested. For more information, see Teradata Vantage™ - Time Series Tables and Operations, B035-1208.

Also, aggregates can be nested in aggregate window functions. The following statement is valid and includes an aggregate SUM function nested in a RANK window function:

   SELECT region
      ,RANK() OVER (PARTITION BY region ORDER by SUM (amount))
   FROM table;