Invention Grant
- Patent Title: Methods and apparatus for propagating functional dependencies with conditions
- Patent Title (中): 用条件传播功能依赖的方法和装置
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Application No.: US12474686Application Date: 2009-05-29
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Publication No.: US08429202B2Publication Date: 2013-04-23
- Inventor: Wenfei Fan , Ming Xiong
- Applicant: Wenfei Fan , Ming Xiong
- Applicant Address: FR Paris
- Assignee: Alcatel Lucent
- Current Assignee: Alcatel Lucent
- Current Assignee Address: FR Paris
- Agency: Ryan, Mason & Lewis, LLP
- Main IPC: G06F17/30
- IPC: G06F17/30

Abstract:
Methods and apparatus are provided for propagating functional dependencies with conditions. Propagation covers are computed using an SPC view of a dataset, wherein the SPC view comprises selection, projection and Cartesian product operations. Selection operations are processed to extract equivalence classes. Cartesian product operations are processed to obtain a renamed set of the plurality of conditional functional dependencies, that have attributes appearing in the SPC view. Domain constraints from the equivalence classes are applied to the renamed set to remove attributes not in the SPC view. Projection operations are processed using a reduction by resolution procedure to identify inferences that can be propagated to the SPC view from the conditional functional dependencies having attributes that do not appear in the SPC view. Domain constraints of the equivalence classes are converted to conditional functional dependencies; and a minimal cover of the SPC view is determined.
Public/Granted literature
- US20100306279A1 Methods and Apparatus for Propagating Functional Dependencies with Conditions Public/Granted day:2010-12-02
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