17.10 - External UDFs - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Fundamentals

Advanced SQL Engine
Teradata Database
Release Number
Release Date
July 2021
Content Type
Programming Reference
Publication ID
English (United States)

External UDFs allow you to write your own functions in the C, C++, or Java programming language, install them on the database, and then use them like standard SQL functions.

You can also install external UDF objects or packages from third-party vendors.

Teradata supports three types of external UDFs.

UDF Type Description
Aggregate Aggregate functions produce summary results. They differ from scalar functions in that they take grouped sets of relational data, make a pass over each group, and return one result for the group. Some examples of standard SQL aggregate functions are AVG, SUM, MAX, and MIN.
Scalar Scalar functions take input parameters and return a single value result. Examples of standard SQL scalar functions are CHARACTER_LENGTH, POSITION, and TRIM.
Table A table function is invoked in the FROM clause of a SELECT statement and returns a table to the statement.