15.10 - Using the NULL Option for SET SESSION CONSTRAINT - Teradata Database

Teradata Database SQL Data Definition Language Syntax and Examples

Teradata Database
Release Number
December 2015
Content Type
Programming Reference
Publication ID
English (United States)
Last Update

The purpose of the NULL option for SET SESSION CONSTRAINT is similar to the NULL option for SET ROLE, where the request removes the active role for a session.

If the session is set to NULL for a constraint in place of one or more constraint names, the assigned constraint set must be currently assigned to the session. If you do not have the OVERRIDE privilege, Teradata Database returns an error. Constraint UDFs can accept a null from data rows, but not from a user session.