17.05 - identity_column - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1144-175K
Language
English (United States)

You cannot specify identity columns for nonpartitioned NoPI tables.

If you specify an identity column for a table that is used with Teradata Unity, you must enable Change Data Multicast (CDM) in Unity and Vantage. See Teradata® Unity™ User Guide, B035-2520.

Identity columns are ANSI SQL:2011-compliant.

UDT, Geospatial, and Period columns are not supported as Identity columns.

See Identity Column Parameters and column_constraint_attributes.

GENERATED ALWAYS AS IDENTITY
Identity column values are always system-generated.
You cannot insert values into, or update, an identity column defined as GENERATED ALWAYS AS IDENTITY.
GENERATED BY DEFAULT AS IDENTITY
Identity column values can be system-generated or user-inserted:
  • When you insert a null into the column, the system generates an identity column value to replace it.
  • When you insert a value into the column, the system inserts the value into the identity column.