17.05 - DEFAULT Function and the HAVING Clause - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1146-175K
Language
English (United States)
The following rules apply to the use of the DEFAULT function as part of the search condition within a HAVING clause:
  • You can specify a DEFAULT function with a column name argument within a predicate. The system evaluates the DEFAULT function to the default value of the column specified as its argument. Once the system has evaluated the DEFAULT function, it treats it like a constant in the predicate.
  • You can specify a DEFAULT function without a column name argument within a predicate only if there is one column specification and one DEFAULT function as the terms on each side of the comparison operator within the expression.
  • Following existing comparison rules, a condition with a DEFAULT function used with comparison operators other than IS NULL or IS NOT NULL is unknown if the DEFAULT function evaluates to null.
A condition other than IS NULL or IS NOT NULL with a DEFAULT function compared with a null evaluates to unknown.
DEFAULT Function Used with this Condition Comparison Result
IS NULL
  • TRUE if the default is null
  • Else it is FALSE
IS NOT NULL
  • FALSE if the default is null
  • Else it is TRUE

For more information about the DEFAULT function, see Teradata Vantage™ - SQL Functions, Expressions, and Predicates, B035-1145.