16.20 - ADD UNIQUE (column_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
Language
English (United States)
Last Update
2019-05-24
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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.