December 2014
Intermediate to advanced
852 pages
17h 57m
English
Content preview from Joe Celko's SQL for Smarties, 5th Edition
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Chapter 18
Subquery Predicates
Abstract
Most programming languages use simple scalar predicates with theta operators. They apply to a single scalar value. SQL also has them, but it also has set-oriented predicates. Since SQL is a set-oriented language this is should not be a surprise. These predicates apply to subsets that are built with subqueries.
Keywords
UNIQUE()
[NOT] EXISTS
[NOT] IN()
< theta > ANY < subquery >
< theta > ALL < subquery >
Most programming languages use simple scalar predicates with theta operators. They apply to a single scalar value. SQL also has them, but it also has set-oriented predicates. Since SQL is a set-oriented language this is should not be a surprise. These predicates apply to subsets that are built with ...
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