16.10 - Queries Using a Hash Index - Teradata Database

Teradata Database SQL Fundamentals

Teradata Database
Release Number
Release Date
June 2017
Content Type
Programming Reference
Publication ID
English (United States)

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.