Queries Using a Hash Index - Advanced SQL Engine - Teradata Database

SQL Fundamentals

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
17.00
Published
June 2020
Language
English (United States)
Last Update
2021-01-24
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B035-1141
lifecycle
previous
Product Category
Teradata Vantageâ„¢

In most respects, a hash index is similar to a base table. For example, you can perform COLLECT STATISTICS, DROP STATISTICS, HELP, and SHOW statements on a hash index.

Unlike base tables, you cannot do the following things with hash indexes:

  • Query or update hash index rows explicitly.
  • Store and maintain arbitrary query results such as expressions.
  • Create explicit unique indexes on its columns.
  • Partition the primary index of the hash index.