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.
- 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.