17.10 - Implicit TIMESTAMP-to-UDT Conversion - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Data Types and Literals

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1143-171K
Language
English (United States)
SQL Engine performs implicit TIMESTAMP-to-UDT conversions for the following operations:
  • UPDATE
  • INSERT
  • Passing arguments to stored procedures, external stored procedures, UDFs, and UDMs
  • Specific system operators and functions identified in other sections of this document, unless the DisableUDTImplCastForSysFuncOp field of the DBS Control Record is set to TRUE

Performing an implicit data type conversion requires that an appropriate cast definition (see Usage Notes) exists that specifies the AS ASSIGNMENT clause.

If no TIMESTAMP-to-UDT implicit cast definition exists, Vantage looks for a CHAR-to-UDT or VARCHAR-to-UDT implicit cast definition that can substitute. Substitutions are valid because Vantage can implicitly cast a TIMESTAMP type to the character data type, and then use the implicit cast definition to cast from the character data type to the UDT. If multiple character-to-UDT implicit cast definitions exist, then SQL Engine returns an SQL error.