Using tosql Transform Routines | CREATE TRANSFORM | Teradata Vantage - 17.10 - Rules For tosql Transform Routines - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Detailed Topics

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1184-171K
Language
English (United States)

A tosql routine transforms a predefined data type to a UDT.

The tosql transform routines are generally used by utilities such as FastLoad to convert incoming client data directly into its corresponding UDT data type in the database.

The rules for tosql routines are as follows:
  • The tosql transform routine can only be a UDF.

    methods are not valid.

  • The tosql UDF transform routine must be defined as DETERMINISTIC.
  • The tosql UDF transform routine must have one and only one declared parameter, which must be a predefined data type.

    The RESULT data type must be the UDT.

  • The tosql UDF transform routine must be contained within the SYSUDTLIB database.
  • If you declare both a tosql transform routine and a fromsql routine, then the declared parameter data type of the tosql routine must be identical to the RESULT data type of the fromsql routine.