Using the NULL Option for SET SESSION CONSTRAINT - Advanced SQL Engine - Teradata Database

SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Published
January 2021
Language
English (United States)
Last Update
2021-01-22
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B035-1144
lifecycle
previous
Product Category
Teradata Vantage™

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, Vantage returns an error. Constraint UDFs can accept a null from data rows, but not from a user session.