15.00 - Aggregate Join Indexes - Teradata Database

Teradata Database SQL Data Definition Language Detailed Topics

prodname
Teradata Database
vrm_release
15.00
category
Programming Reference
featnum
B035-1184-015K

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.