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Understand Relational Databases Read chapter Read first chapter

2019 | OriginalPaper | Chapter

6. Build Sets with Inline Views and ANSI Join Syntax

Author : Jon Heller

Published in: Pro Oracle SQL Development

Publisher: Apress

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Abstract

We’re almost ready to dive into advanced SQL features. In Part I we built a solid foundation for SQL programming. Before we start using advanced features, we need to discuss how to construct our SQL statements.

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Footnotes
1
It’s rare, but still possible to have an accidental cross join with the ANSI join syntax. For example, a cross join happens if we join a multicolumn foreign key by only one column.
 
2
Based on the paper “The Magical Number Seven, Plus or Minus Two” by George A. Miller.
 
3
Oracle 12c introduced lateral joins, which allow inline views to reference things outside of the inline view. That new feature defeats the whole purpose of inline views and should be avoided.
 
4
Numbering isn’t generally necessary with inline views. Showing code in a book is a bit more challenging than using code in an IDE. Without IDE features such as parentheses matching, highlighting, and code folding, the numbering is helpful to keep track of how the data flows.
 
Metadata
Title
Build Sets with Inline Views and ANSI Join Syntax
Author
Jon Heller
Copyright Year
2019
Publisher
Apress
Book
Pro Oracle SQL Development

Print ISBN: 978-1-4842-4516-3

Electronic ISBN: 978-1-4842-4517-0

Copyright Year: 2019

DOI
https://doi.org/10.1007/978-1-4842-4517-0_6

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