My Secret for tuning complex Oracle SQL queries

In College, the professors require "syntactically tight" SQL, showing all of the features such as inline views and nested subqueries.  But the academic solution is often hard to read, and the nested subqueries perform very poorly.  Traditionally, un-nesting subqueries can have a tremendous performance impact, and Oracle provides two tools for this, CTAS with Global Temporary tables and the exciting SQL99 WITH clause.

Read below how you can simplify and improve the performance of complex Oracle queries:


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