Presentation about grouping

At May 26 I will be doing a presentation at Planboard's Oracle DBA Symposium. The presentation is about grouping in SQL and more specific about rollups, cubes and grouping sets and how they work on the outside and on the inside.

Even though the symposium is aimed at DBA's, I see several interesting presentations for me as a database developer as well. I'm looking forward to those presentations and I am keeping my fingers crossed that they won't be at the same time as my own ...