17.05 - 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 name of the external UDF to be used to convert source_data_type to target_data_type. The 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, the function must be the only external UDF with that name in the database.
The function can have only one parameter. The result data type must be the same as target_data_type. The function must be defined to be deterministic. The function name must identify an external UDF in the SYSUDTLIB database.
data type
The parameter data type must be the same as source_data_type.
UDT_name
The parameter data type must be the same as source_data_type.