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Published in:
Understand Relational Databases Read chapter Read first chapter

2019 | OriginalPaper | Chapter

7. Query the Database with Advanced SELECT Features

Author : Jon Heller

Published in: Pro Oracle SQL Development

Publisher: Apress

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Abstract

SELECT is the most important SQL statement type. Even when we’re changing data, most of the logic will go in the SELECT and WHERE clauses of the statement. Before we can insert, update, or delete a set, we must be able to choose a set.

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previous chapter Build Sets with Inline Views and ANSI Join Syntax
next chapter Modify Data with Advanced DML
Footnotes
1
You could argue that a programming language doesn’t need operators, only functions. Removing operators would make the language more consistent. Realistically, although it is more consistent to write PLUS(1,1), our code looks better if we write 1+1. On the other hand, languages with too many operators can lead to cryptic syntax, like many Perl programs.
 
2
In old versions of Oracle, the DUAL table was a real table. Since DUAL was a real table, it was possible to change it, which led to strange bugs. In current versions, DUAL is a special memory structure that can’t be changed and performs better than a regular table.
 
Metadata
Title
Query the Database with Advanced SELECT Features
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_7

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