16.10 - NUSIs and Covering - Teradata Database

Teradata Database SQL Fundamentals

Product
Teradata Database
Release Number
16.10
Published
June 2017
Language
English (United States)
Last Update
2018-04-25
dita:mapPath
klx1480972732157.ditamap
dita:ditavalPath
changebar_rev_16_10_exclude_audience_ie.ditaval

The Optimizer aggressively pursues NUSIs when they cover a query. Covered columns can be specified anywhere in the query, including the select list, the WHERE clause, aggregate functions, GROUP BY clauses, expressions, and so on. Presence of a WHERE condition on each indexed column is not a prerequisite for using a NUSI to cover a query.