Example: Create User-Defined Aggregate Function - Teradata Vantage

This example shows a user-defined aggregate function with an input parameter named parameter_1 declared as VARIANT_TYPE data type. The SELECT statement calls the new function using the NEW VARIANT_TYPE expression to create a dynamic UDT with two attributes named a and b.

CREATE TYPE INTEGERUDT AS INTEGER FINAL;
CREATE FUNCTION udf_agch002002dynudt (parameter_1  VARIANT_TYPE)
RETURNS INTEGERUDT CLASS AGGREGATE (4) LANGUAGE C  NO SQL
EXTERNAL NAME   'CS!udf_agch002002dynudt!udf_agch002002dynudt.c'
PARAMETER STYLE SQL;
SELECT udf_agch002002dynudt(NEW VARIANT_TYPE (Tbl1.a AS a,
                                             (Tbl1.b + Tbl1.c) AS b))
FROM Tbl1;