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https://docs.teradata.com/reader/J7xnIqCYY4AH4vc0_tlIOw/N6l7REwKe2zr4t74luEjVQ
You can use a scalar function in place of a column name in an expression. When Teradata Database evaluates the expression, it invokes the scalar function. No context is retained after the function completes. You can also use a scalar function to implement user-defined type (UDT) functionality such as cast, transform, or ordering.
https://www.tableau.com/blog/tableau-teradata-geospatial
Oct 05, 2008 · Many database systems are highly extensible through user-defined types (UDTs), methods (UDMs) and functions (UDFs). Database system vendors often provide UDFs to assist users with migrating from a competitor's DBMS to their own. But UDTs, UDFs and UDMs also provide domain-specific functionality, as seen in Teradata's Geospatial Extensions.
https://docs.teradata.com/reader/WurHmDcDf31smikPbo9Mcw/bX3Z3akNqHj6vtUHnLkttw
The Teradata ARRAY data type is a user-defined type (UDT). This differs from the ANSI standard which does not consider an ARRAY data type to be a UDT. Teradata syntax for the ARRAY value constructor is based on the UDT constructor syntax. This differs from the ANSI syntax. ANSI-style comparison of two arrays (A=B) is not supported.
https://downloads.teradata.com/database/reference/cc-coded-user-defined-function-scenario
User-defined functions (UDFs) allow you to create your own functions and add them to Teradata Database to extend its built-in capabilities. You can create new functions in C/C++, Java, or in SQL itself and use them in SQL queries just like Teradata Database built-in functions.
https://anydatablog.wordpress.com/2016/07/01/in-database-support-for-sas-functions/
Jul 01, 2016 · In SAS solutions where data is stored in a third-party database such as Oracle, Teradata, or DB2, network I/O latency becomes a bottleneck in performance. This post explains a method to replicate SAS native functions in a third-party database. The method includes writing user-defined functions (UDFs) and running those functions via SAS implicit pass-through (IP).…
http://www.teradatawiki.net/2013/09/Teradata-Functions.html
It does not actually execute the SQL statement however it is a good way to see what database resources will be used in processing your request. For instance, if you see that your request will force a full-table scan on a very large table or cause a Cartesian Product Join, you may decide to re-write a request so that it executes more efficiently.
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