15.00 - HELP INDEX and Hash, Join and Covering Indexes - Teradata Database

Teradata Database SQL Data Definition Language Detailed Topics

Teradata Database
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Programming Reference
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English (United States)

HELP INDEX and Hash, Join and Covering Indexes

HELP INDEX does not report information about hash or join indexes.

HELP INDEX does report on the indexes defined on hash and join indexes, as explained in the following table:


FOR this type of index …

Information is reported on the following index characteristics …


  • Primary index defined by default based on the primary index of its underlying table.
  • Primary index defined explicitly by means of the BY and ORDER BY clauses of the CREATE HASH INDEX statement.
  • See “Specifying the Primary Index for a Hash Index” on page 322 for information about these primary indexes.


    Primary index defined for the join index.

    Any secondary indexes defined on the join index.

    HELP INDEX does not report the ordering columns for a covering index or value‑ordered join index. SHOW TABLE reports these columns (see “SHOW object” on page 993).