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Oracle 10g Enhanced Merge Functionality

In Oracle Database 10g, the MERGE statement has been extended to cover a larger variety of complex and conditional data transformations, allowing faster loading of large volumes of data.

You should use the MERGE statement to select rows from one or more sources for insert or update of one or more tables. The decision to perform an insert or update is based on conditions specified by you.

The MERGE statement is designed to combine multiple operations to reduce the complexity of mixed insert and update operations. MERGE allows you to avoid multiple INSERT, UPDATE, and DELETE DML statements by combining the operations into a single statement. MERGE is what is known as a deterministic statement. That is, you can only update the same row of the target table once in the same MERGE statement.

Prerequisites

Since MERGE combines INSERT and UPDATE operations, you must have the INSERT and UPDATE object privileges on the target table, and of course, the SELECT object privilege on the source table. If you need to specify the DELETE clause of the merge_update_clause, then you must also have the DELETE object privilege on the target table.


Get the complete story:

The above text is an excerpt from "Oracle Database 10g New Features: Reference for Advanced Tuning and Administration", by Rampant TechPress.  Written by top Oracle experts, this book has a complete online code deport with ready to use scripts. 

To get the code instantly, click here:

http://rampant-books.com/book_2003_2_oracle10g.htm


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