17.10 - Relationship Between EXISTS/NOT EXISTS and IN/NOT IN - 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)

EXISTS predicate tests the existence of specified rows of a subquery. In general, EXISTS can be used to replace comparisons with IN and NOT EXISTS can be used to replace comparisons with NOT IN. However, the reverse is not true. Some problems can be solved only by using EXISTS and/or NOT EXISTS predicate. For an example, see For ALL.