15.10 - Identity Column - Teradata Database

Teradata Database SQL Data Definition Language Syntax and Examples

prodname
Teradata Database
vrm_release
15.10
created_date
December 2015
category
Programming Reference
featnum
B035-1144-151K

You cannot specify identity columns for nonpartitioned NoPI tables.

You should not specify an identity column for a table that will be used with Unity Director.

Identity columns are ANSI SQL:2011-compliant.

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.