22nd Chinese National Database Conference (NDBC2005): Keynote. Title: Order Queries over Data Streams. Japanese DbWeb (2005): Invited Talk. Title: Order Queries over Data Streams. 18th Australiasian Database Conference (ADC2007): Invited Talk. Title: Continuously Maintaining Order Statistics over Data Streams. 18th International Workshop on Combinatorial Algorithms (IWOCA07): Keynote.Title: Computing the top-K Skyline Points. 2007 IEEE/IFIP International Workshop on Frontier of Data-Driven Engineering (FDDE2007): Invited. Title: Probabilistic Queries. The 10th Asia Pacific Web Conference (APweb08): Keynote. Title: Aggregate Computation over Data Streams. The 9th International Conference on Web-Age Information Management (WAIM08): Keynote. Title: Skyline Computation.