Database Keys | SQL Fundamentals | Teradata Vantage - 17.10 - Keys - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Fundamentals

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1141-171K
Language
English (United States)
A primary key is a column, or combination of columns, in a table that uniquely identifies each row in the table. The values defining a primary key for a table:
  • Must be unique
  • Cannot change
  • Cannot be null

A foreign key is a column, or combination of columns, in a table that is also the primary key in one or more additional tables in the same database. Foreign keys provide a mechanism to link related tables based on key values.