INTERVAL-to-UDT Conversion - Teradata Database

INTERVAL-to-UDT Conversion

Purpose

Converts interval data to UDT data.

CAST Syntax

where:

Syntax element …	Specifies …
interval_expression	an interval expression to be cast to a UDT.
UDT_data_definition	the UDT type to which interval_expression is to be converted.

ANSI Compliance

This is ANSI SQL:2011 compliant.

As an extension to ANSI, CAST permits the use of data attribute phrases such as FORMAT.

Usage Notes

Explicit INTERVAL-to-UDT conversion using Teradata conversion syntax is not supported.

Data type conversions involving UDTs require appropriate cast definitions for the UDTs. To define a cast for a UDT, use the CREATE CAST statement. For more information on CREATE CAST, see SQL Data Definition Language.

Implicit INTERVAL-to-UDT Conversion

Performing an implicit data type conversion requires a cast definition (see “Usage Notes” on page 662) that specifies the following:

the AS ASSIGNMENT clause

a source data type that is in the same INTERVAL family as the source of the implicit cast:

This INTERVAL data type …	Belongs to this INTERVAL family …
INTERVAL YEAR INTERVAL YEAR TO MONTH INTERVAL MONTH	Year-Month
INTERVAL DAY INTERVAL DAY TO HOUR INTERVAL DAY TO MINUTE INTERVAL DAY TO SECOND INTERVAL HOUR INTERVAL HOUR TO MINUTE INTERVAL HOUR TO SECOND INTERVAL MINUTE INTERVAL MINUTE TO SECOND INTERVAL SECOND	Day-Time

The source data type of the cast definition does not have to be an exact match to the source of the implicit type conversion.

Teradata Database performs implicit INTERVAL-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 book, unless the DisableUDTImplCastForSysFuncOp field of the DBS Control Record is set to TRUE

Related Topics

For details on data types and data attributes, see SQL Data Types and Literals.