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Tips on using NOT EXISTS and MINUS in SQL

In this excellent article by Chris Lawson, author of the bestselling “The Art and Science of Oracle Performance Tuning”, we see a great discussion of SQL optimization for NOT EXISTS clauses in Oracle SQL queries:

http://www.oraclemagician.com/mag/magic8.pdf

Lawson notes that there are many ways to filter SQL results sets, and that the MNINUS operator can often result in faster execution plans.

By rewriting our query using the MINUS operator, we accept a full table scan and there really isn’t just one right way to design queries.

In some cases, you really are better off using Not Exists. In many cases, however, you should use the set operator MINUS. Once you understand the principles, you can easily choose the best method for your particular case.

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