16.20 - Identity Column - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Syntax and Examples

prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
created_date
March 2019
category
Programming Reference
featnum
B035-1144-162K

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 Teradata Database. 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 Clause.

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.