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Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts
book

Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts

by John Adolph Palinski
August 2002
Intermediate to advanced content levelIntermediate to advanced
528 pages
10h 12m
English
Addison-Wesley Professional
Content preview from Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts

Join Operations

When the SQL statement contains a join condition, the optimizer must decide which method to use in order to combine the retrieved records. There are several available methods. Each of the methods is better in a certain situation. Normally Oracle will choose the proper join operation. However, algorithms are not always perfect. It may be necessary to change the selected join type using a hint. The following sections will describe the various join types.

Nested-Loop Join

In a nested-loop join, Oracle identifies target records in one table, called the driving table, and then locates corresponding records in a second table, called the inner table. Oracle generally uses an index to identify records in the driving table and scans ...

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Publisher Resources

ISBN: 0201752948Purchase book