UNIQUE Constraint - Advanced SQL Engine - Teradata Database

SQL Data Types and Literals

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
17.00
Published
June 2020
Language
English (United States)
Last Update
2021-01-22
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B035-1143
lifecycle
previous
Product Category
Teradata Vantage™

A column or set of columns defined as UNIQUE must also be NOT NULL.

Teradata Database instantiates UNIQUE as a unique primary or secondary index. One or more columns or sets of columns can be defined as UNIQUE for a table.

For more details, see:

  • “CREATE TABLE” in Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144
  • “Constraint Specifications” in Teradata Vantage™ - Database Design, B035-1094.