15.00 - Aggregate Join Indexes - Teradata Database

Teradata Database SQL Data Definition Language Detailed Topics

Product
Teradata Database
Release Number
15.00
Content Type
Programming Reference
Publication ID
B035-1184-015K
Language
English (United States)

Aggregate Join Indexes

An aggregate join index is a join index that specifies SUM, COUNT, MIN, or MAX aggregate operations. No other aggregate functions are permitted in the definition of a join index.

The primary function of an aggregate join index is to provide the Optimizer with a high‑performing, cost-effective means for satisfying any query that specifies a frequently made aggregation operation on one or more columns. The aggregate join index permits you to define a summary table without violating schema normalization.