17.05 - specific_function - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1144-175K
Language
English (United States)
function_name
The specific name of the external UDF to be used to convert source_data_type to target_data_type. The specific_function_name must specify a unique function.
You cannot invoke an SQL UDF from a CREATE CAST or REPLACE CAST request.
If you do not specify a set of data types for a function name, then the specified function must be the only external UDF with that name in the database.
The specified function must satisfy the following conditions:
  • It can have only one parameter.

    Its parameter data type must be the same as source_data_type.

  • Its result data type must be the same as target_data_type.
  • It must be defined to be deterministic.
  • Its function name must identify an external UDF in the SYSUDTLIB database.