Deterministic Characteristics Clause - Analytics Database - Teradata Vantage

SQL Data Definition Language Detailed Topics

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2023-07-11
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B035-1184
lifecycle
latest
Product Category
Teradata Vantage™

This optional clause declares whether the function returns the same results for identical inputs or not.

Vantage supports the following deterministic characteristics options:
  • DETERMINISTIC
  • NOT DETERMINISTIC

Vantage must evaluate each row selected by a nondeterministic UDF condition individually because the evaluation of the function can change for each row selected within a query. This qualification includes both specifying NOT DETERMINISTIC explicitly and not specifying DETERMINISTIC, because NOT DETERMINISTIC is the default option for the clause.

A predicate that includes a nondeterministic UDF specified on an index results in an all-AMP operation in spite of the index having been specified in the predicate.