16.20 - MODIFY CHECK (boolean_condition ) - 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

Change an existing CHECK constraint. The table or column constraint must already exist.
Teradata Database scans existing rows of the table to validate that the current values conform to the specified constraint. Otherwise, the system returns an error to the requestor and does not change the table definition.

CONSTRAINT name
Named CHECK column constraint as a table attribute. Specify a column_name on the left-hand side of boolean_condition.