Can you give the multiple rows an id and use that ? In your example , can you assign a user-group id for each type of user (or maybe a map with attributes if a user can belong to multiple groups), and then process using that attribute or id ? (I might not have understood the problem correctly, example of input and output data might help) -Thejas
On 8/28/10 11:10 AM, "Christian Decker" <decker.christ...@gmail.com> wrote: > The title might be a bit misleading but I hope you can help me. > I have some data (let's say a Web Log file) and I want to be able to compare > multiple items with each other. For example I want to know what items are > popular in certain user groups, which means that I want to find items which > got many successive hits from users from that group in a short period of > time. > Until now I only worked on the rows in an isolated manner, that is items > could be filtered or modified, without any knowledge of other records, but > this now requires to consider multiple records, and I have no clue as to how > approach this problem. > > Any suggestions? > > Regards, > Chris >
