17.05 - MINUS/EXCEPT and NULL - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Published
January 2021
Language
English (United States)
Last Update
2021-01-22
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When you specify an explicit NULL for any exception operation, its data type is INTEGER. For an example of this principle using the UNION operator, see Example: Effect of Explicit NULLs on Data Type of a UNION.

On the other hand, column data defined as NULL has neither value nor data type and evaluates like any other null in a scalar expression.