16.20 - Constructor Methods - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Detailed Topics

Product
Teradata Database
Teradata Vantage NewSQL Engine
Release Number
16.20
Release Date
March 2019
Content Type
Programming Reference
Publication ID
B035-1184-162K
Language
English (United States)

A structured UDT can have more than one constructor method, each of which provides a different initialization option. Constructors have the same method name; however, their parameter lists are different, meaning that their method signatures are different.

The following is an example of a constructor method for the structured type address:

    CREATE TYPE address
    ...
    CONSTRUCTOR METHOD address(VARCHAR(20), CHARACTER(5) )
    RETURNS address
    SELF AS RESULT
    LANGUAGE C
    DETERMINISTIC

This constructor method takes two character strings as input and uses them to initialize the attributes of the address structured type.

You can invoke constructor methods using the NEW syntax (see SQL Functions, Operators, Expressions, and Predicates for details).

The following bullets briefly summarize how to invoke a constructor method:

  • NEW syntax:
        NEW structuredTypeName( ... )
  • NEW example:
        NEW address('10795 Via Del Campo', '92127')