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The order of the columns in GROUP BY doesn`t matter? why?

672680Dec 21 2010 — edited Dec 22 2010

I did a little test and find out that the order of the columns in GROUP BY does not matter to ORACLE.
Why? How does oracle do GROUP BY exactly?
Could anyone show me its processing logic? maybe in pseudo-code?

Thanks in advance.

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Locked on Jan 19 2011

Added on Dec 21 2010

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