17.10 - Alternatives To Nulls for Representing Missing Information - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Database Design

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
User Guide
Publication ID
B035-1094-171K
Language
English (United States)

Unlike every other feature of the database relational model, the treatment of missing information is not based on a formal foundation. As a result, even though the usual explanations of nulls often appear to make common sense, any detailed investigation reveals a number of potentially serious problems with SQL nulls.

The following sections describe some proposed alternative solutions to the missing value problem.