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Quiz Post #1 : SQL Magic

Q: is it my possible to make my query to change from “select ‘what is my name’ from dual” to “select ‘you’r Geek DBA’ from dual” during execution.

A: this feature is called “query equivalence”.

query equivalence is declared using the dbms_advanced_rewrite.declare_rewrite_equivalence procedure, and uses the syntax:

dbms_advanced_rewrite.declare_rewrite_equivalence(declaration_name,source_statement,target_statement);

September 28th, 2012 | Tags: | Category: Quick Questions, SQLTuning | Comments are closed