17.10 - General - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - ANSI Temporal Table Support

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1186-171K
Language
English (United States)
  • Valid time is the Teradata implementation of what ANSI calls “application time.”
  • The valid_start and valid_end columns must be defined as NOT NULL.
  • The data types of the valid_start and valid_end columns must match.
  • To function as a temporal table, the valid-time table must be defined AS VALIDTIME. System-time tables do not have valid time.
  • A table can have only one valid-time period definition.
  • A valid-time table cannot be a queue, error, or global temporary trace table.
  • Statistics cannot be collected on the valid-time derived period column, but they can be collected on the component start and end time columns.
  • Algorithmic compression (ALC) is not allowed on DateTime columns that act as the beginning and ending bound values of a temporal derived period column.