Patents by Inventor Josephine M.-K. Cheng

Josephine M.-K. Cheng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5367675
    Abstract: An automated method is provided for optimizing a query for retrieving data from a relational database in a computer relational database management system. The method uses rules for identifying queries for which duplicates are a factor in retrieving the proper data from the database. The method then merges queries with table expressions, views and subqueries when possible without causing duplicates to be unnecessarily retrieved.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: November 22, 1994
    Assignee: International Business Machines Corporation
    Inventors: Josephine M.-K. Cheng, Sheldon J. Finkelstein, Donald J. Haderle, Mir H. Pirahesh, Yun Wang