Ting Yu Leung

Optimization of correlated SQL queries in a relational database management system

Optimizing database queries using query execution plans derived from automatic summary table determining cost based queries

Evaluation of existential and universal subquery in a relational database management system for increased efficiency

Query optimization by transparently altering properties of relational tables using materialized views

Parallel query optimization strategies for replicated and partitioned tables

Efficient implementation of full outer join and anti-join

Method of optimizing a query having an existi subquery and a not-exists subquery

Method of optimizing SQL queries where a predicate matches nullable operands

Automatic recognition and rerouting of queries for optimal performance

Support for summary tables in a heterogeneous database environment