CREATE/REPLACE FUNCTION Examples | Teradata Vantage - 17.05 - Example: Creating a Function from Input Arguments - 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)

This example takes variable input arguments based on input from a previous correlated subquery in the FROM clause of a SELECT request, that is not shown. The function definition inputs XML text, which it then parses to extract a customer ID, store number, and the set of items purchased. The output produces one row per item purchased, with the columns being based on existing columns in the table defined in the function definition.

    CREATE FUNCTION xml_extract( xml_text VARCHAR(64000))
      RETURNS TABLE (cust_id INTEGER,
                     store   INTEGER,
                     item    INTEGER)
    LANGUAGE C
    NO SQL
    EXTERNAL;