15.10 - ADD UNIQUE (column_name) - Teradata Database

Teradata Database SQL Data Definition Language Syntax and Examples

prodname
Teradata Database
vrm_release
15.10
created_date
December 2015
category
Programming Reference
featnum
B035-1144-151K
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.