17.05 - PRIMARY KEY (column_name) - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1144-175K
Language
English (United States)

A column or column set as the PRIMARY KEY constraint for the table. Columns specified in a PRIMARY KEY constraint must all be defined as NOT NULL.

For nontemporal tables, the PRIMARY KEY constraint implicitly uses a USI.

For temporal tables, the PRIMARY KEY constraint implicitly uses a single-table join index or, in certain cases, a USI. For details, see Teradata Vantage™ - Temporal Table Support , B035-1182 .

For an unnamed PRIMARY KEY table constraint, use this syntax:

     CONSTRAINT PRIMARY KEY (column_name)
CONSTRAINT constraint_name
For a named PRIMARY KEY table constraint, use this syntax:
     CONSTRAINT constraint_name PRIMARY KEY (column_name)
If you specify multiple columns, the primary key constraint is based on the combined values of the specified columns. The primary key for the table can consist of up to 64 columns.