Patents by Inventor Stephen Fife Sheldon

Stephen Fife Sheldon 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).

  • Performing SQL query optimization by simplifying sub-expressions
    Patent number: 8140521
    Abstract: A method, computer program, and database system are disclosed for processing a database query that includes one or more expressions. The method includes resolving columns in one or more of the expressions. Expression optimization is performed on one or more of the expressions. Afterward, further query optimization is performed.
    Type: Grant
    Filed: March 15, 2004
    Date of Patent: March 20, 2012
    Assignee: Teradata US, Inc.
    Inventors: Stephen Fife Sheldon, Arthur Vargas Lopes, Grace Kwan-On Au, Ahmad Said Ghazal
  • Method and system for transforming multiple alternative equality conditions
    Patent number: 7457795
    Abstract: A method, computer program, and computer network are disclosed for transforming multiple alternative equality conditions between a database column and a set of values. The method includes identifying one or more groups of consecutive values in the set. The equality conditions corresponding to values found in one or more of the identified groups are removed. One or more inequality conditions corresponding to the one or more of the identified groups are added.
    Type: Grant
    Filed: January 19, 2004
    Date of Patent: November 25, 2008
    Assignee: Teradata US, Inc.
    Inventors: Stephen Fife Sheldon, Arthur Vargas Lopes