16.20 - ADD CONSTRAINT name - 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
Content Type
Programming Reference
Publication ID
B035-1144-162K
Language
English (United States)
Last Update
2019-05-24

Add a named constraint.

If you alter a nontemporal table that is defined with CHECK constraints into a temporal table with either valid time or transaction time, Teradata Database automatically converts the definitions for those existing constraints into CURRENT CHECK constraints.

However, if there are any existing UNIQUE or PRIMARY KEY constraints defined on the nontemporal table, the system returns an error to the requestor.

You cannot place a constraint on a column with the JSON data type.