October 2013
Intermediate to advanced
580 pages
18h 5m
English
book
Pro Oracle SQL, Second Edition
by Karen Morton, Kerry Osborne, Robyn Sands, Riyaj Shamsudeen, Jared Still
Content preview from Pro Oracle SQL, Second Edition
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CHAPTER 10
Subquery Factoring
You may not be familiar with the term subquery factoring. Prior to the release of Oracle 11gR2, the official Oracle documentation barely mentions it, providing just a brief synopsis of its use, a couple of restrictions, and a single example. If I instead refer to the WITH clause of the SELECT statement, you probably know immediately what I mean, because these terms are more recognizable. Both terms are used in this chapter.
In Oracle 11gR2 (version 11.2), the WITH clause was enhanced with the ability to recurse; that is, the factored subquery is allowed to call itself within some limitation. The value of this may ...
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