Dear Khaled, for questions about MonetDB, I kindly ask you to use the respective mailing list(s); I Cc my answer to the users list. See also http://www.monetdb.org/Developers/Mailinglists On Mon, May 13, 2013 at 06:41:45PM +0200, Khaled Dehdouh wrote:

Dear sir,

I am a student at university of LYON. Concerning MonetDB, I need your help, please on some points.

- I want to do some optimizations in "GROUP BY" function of SQL module. For this end, can you show me where is exactly the function code responsible to perform the "Group By" operation on MonetDB source codein order to modif y it.

I'm wondering how you know that "optimizations" are necessary/possible without knowing the actual code, but I guess you know. You find the respective code in gdk/gdk_group.c

- I would like to know also how to recompile the code after modification of the "GROUP BY" function.

See http://www.monetdb.org/Developers/SourceCompile http://dev.monetdb.org/hg/MonetDB/file/tip/HowToStart.rst http://dev.monetdb.org/hg/MonetDB/file/1272d67f24be/buildtools/doc/windowsbu...

- How creating a new SQL command that performs function with parameters and combines two existing functions in MONETDB.

See http://www.monetdb.org/Documentation/SQLreference/Modules or your favorite SQL:2003 documentation. MonetDB is SQL standard compliant. Best, Stefan

Thanks in advance.

Best regards, Khaled DEHDOUH.

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