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Group By Support

by wolf at 22-8-2008 16:05; Wiki ID: GroupBySupport

I'm student in Computer Science at the Free University of Brussel (ULB).

For my end of studies work, i would like to add the keyword groupby to XQuery in order to evaluate the advantages of this addition for OLAP queries on a XML datawarehouse.

For example here a multiple groupby in Xquery :

This expression suggest several passes over all the data.

Its equivalent in sql :

I would like to implement something like that with eXist :

This last expression is easier to optimise and need less passes on the data.

PS : sorry for my poor english ;-)

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