16.20 - Restrictions on the Data Types in a COALESCE Expression - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
16.20
Release Date
March 2019
Content Type
Programming Reference
Publication ID
B035-1145-162K
Language
English (United States)

The following restrictions apply to CLOB, BLOB, and UDT types in a COALESCE expression.

Data Type Restrictions
BLOB A BLOB can only appear in the argument list when it is cast to BYTE or VARBYTE.
CLOB A CLOB can only appear in the argument list when it is cast to CHAR or VARCHAR.
UDT Multiple UDTs can appear in the argument list only when they are identical types because Teradata Database does not perform implicit type conversion on UDTs in a COALESCE expression.