15.10 - CAST FROM data type - Teradata Database

Teradata Database SQL Data Definition Language Syntax and Examples

Product
Teradata Database
Release Number
15.10
Published
December 2015
Content Type
Programming Reference
Publication ID
B035-1144-151K
Language
English (United States)

The result type returned by the method that is to be converted to the type specified by the RETURNS clause.

If you specify a CAST FROM clause, there must be an existing cast from the “result cast from” data type to the returns data type.

Example:

  ...RETURNS DECIMAL(9,5) CAST FROM FLOAT...

If data type is a UDT, then the appropriate cast and transform must be defined to handle its conversion. See CREATE CAST and REPLACE CAST and CREATE TRANSFORM and REPLACE TRANSFORM.

Whenever a LOB that requires data type conversion is passed to a method, the LOB must first be materialized for the conversion to take place.

If data type contains a locator indication, then you cannot specify a CAST FROM clause for the method.