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

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.