17.10 - ADD UNIQUE (column_name) - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1144-171K
Language
English (United States)
A column set as the UNIQUE constraint column set for table_name. The columns must be defined as NOT NULL.
If you specify more than one column_name, the UNIQUE column set is based on the combined values of the specified column name.
For an unnamed UNIQUE table constraint, use this syntax:
     ADD UNIQUE (column_name)

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

CONSTRAINT name
For a named UNIQUE table constraint, use this syntax:
     ADD CONSTRAINT constraint_name UNIQUE (column_name)
A UNIQUE table constraint can be defined on a maximum of 64 columns.