Relationship Between EXISTS/NOT EXISTS and IN/NOT IN

Teradata Vantageā„¢ SQL Functions, Expressions, and Predicates

brand
Software
Teradata Vantage
prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1145-162K

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.