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What is Set-Oriented Condition

Chapter 2
Handbook of Research on Innovative Database Query Processing Techniques
A condition that involves a variable number of tuples. The precise tuples involved in the condition may have to be determined by another query (in SQL, a subquery).
Published in Chapter:
Set-Oriented Queries in SQL
Antonio Badia (University of Louisville, USA)
Copyright: © 2016 |Pages: 24
DOI: 10.4018/978-1-4666-8767-7.ch002
Abstract
Set-oriented queries are those that require a condition to hold of an arbitrary set of rows, either when comparing the set to a single row or to another set of rows. Examples of such queries are universally quantified queries and skyline queries. These queries, while important for data processing, are difficult to write and difficult to process. In this chapter we review research dealing with the specification and optimization of such queries. We present several approaches proposed to deal with universal quantification as well as with set predicates in general.
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