17.10 - Example: Using DEFAULT in a Predicate - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1145-171K
Language
English (United States)

The following statement uses DEFAULT to compare the values of the Dept_No column with the default value of the Dept_No column. Because the comparison operation involves a single column reference, Vantage can derive the column context of the DEFAULT function even though the column name is omitted.

   SELECT * FROM Employee WHERE Dept_No < DEFAULT;

Note that if the DEFAULT function evaluates to null, the predicate is unknown and the WHERE condition is false.