16.20 - About Table Column Elements - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Detailed Topics

Teradata Database
Teradata Vantage NewSQL Engine
Release Number
March 2019
Content Type
Programming Reference
Publication ID
English (United States)

This clause defines the table column elements.

You must specify a name and data type for each column defined for a table. When you create a table copy using the CREATE TABLE … AS syntax, you either carry over the source table column types by default or specify new column data types using a query expression. Each data type can be further defined with one or more attribute definitions.

You can specify the following optional column attributes:
  • Data type attribute declaration
  • Column nullability
  • Multivalue and algorithmic compression
  • Column storage attributes
  • Output format attributes
  • Default value attributes

    See Teradata Vantage™ Data Types and Literals, B035-1143 for details about the preceding list of attributes.

  • Column constraint attributes
    • PRIMARY KEY constraint definition
    • UNIQUE constraint definition
    • FOREIGN KEY REFERENCES constraint definition
    • CHECK constraint definition
    • Row-level security constraint assignments.

    You can also specify PRIMARY KEY, UNIQUE, FOREIGN KEY, and CHECK constraints as table attributes, but you cannot specify a row-level security constraint as a table attribute.