Audit using Oracle 10g XE

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I have data that I am presenting in a datagrid. I have to add the totals for every column and row. I have found OLAPDataGrid that is capable of that. However I can't seem to find a basic tutorial. The few I have found are very complex and involve lots of other queries. I just need a basic start to get myself wrapped around this.I'm also gaining a great knowledge from a book on OLAP.The book is available on Amazon & you can buy an e-book directly from the publisher by writing OLAPWorldPress@gmail.com.