16.20 - Using the NULL Option for SET SESSION CONSTRAINT - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Syntax and Examples

Product
Teradata Database
Teradata Vantage NewSQL Engine
Release Number
16.20
Published
March 2019
Language
English (United States)
Last Update
2019-05-24
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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.