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 11
Semijoins and Antijoins
Semijoins and antijoins are two closely related join methods (options of join methods, actually) that the Oracle optimizer can choose to apply when retrieving information. The SQL language is designed to specify the set of data the user wishes to retrieve, but to leave the decisions regarding how to navigate to the data up to the database itself. Therefore, there is no SQL syntax to invoke a particular join method specifically. Of course, Oracle does provide the ability to give the optimizer directives via hints. In this chapter, I explain these two join optimization options, the SQL syntax that can provoke ...
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