We have a Christmas surprise for you! Bruce Momjian from the PostgreSQL core team will visit us and deliver a talk 'Postgres Window Magic'.
Normal SQL queries return rows where each row is independent of the other returned rows. SQL window functions allow queries to return computed columns based on values in other rows in the result set. This presentation explains the many window function facilities and how they can be used to produce useful SQL query results.
Bruce Momjian is co-founder and core team member of the PostgreSQL Global Development Group, and has worked on PostgreSQL since 1996. He has been employed by EnterpriseDB since 2006. He has spoken at many international open-source conferences and is the author of PostgreSQL: Introduction and Concepts, published by Addison-Wesley. Prior to his involvement with PostgreSQL, Bruce worked as a consultant, developing custom database applications for some of the world's largest law firms. As an academic, Bruce holds a Masters in Education, was a high school computer science teacher, and lectures internationally at universities.