Column and Table Constraints - 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™

You can specify constraints during table creation and modification.

Column constraints apply to single columns as a part of the column definition. Column constraints include:
  • CHECK constraint definition clause on a single column
  • PRIMARY KEY constraint definition clause on a single column
  • REFERENCES constraint definition clause on a single column
  • UNIQUE constraint definition clause
Table constraints apply to multiple columns. Table-level constraints include:
  • CHECK constraint definition clause on multiple columns
  • REFERENCES constraint definition clause on multiple columns
  • PRIMARY KEY constraint definition clause on multiple columns
  • UNIQUE constraint definition clause on multiple columns
  • FOREIGN KEY constraint definition clause

    FOREIGN KEY constraint definitions must also specify a REFERENCES clause.

The full syntax for constraints is in “ALTER TABLE” and “CREATE TABLE” in Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144