Resources Contact Us Home
Method and system for generating a statistical summary of a database using a join synopsis

Image Number 6 for United States Patent #6477534.

A method for generating an approximate answer to a query in a database environment in which the database has a plurality of base relations. A query relating to a database is received, and an approximate answer to the query is generated such that the approximate answer is based on at least one join synopsis formed from the database. The method further includes steps of forming a sample-tuple set for at least one selected base relation of a plurality of base relations of a database such that each sample-tuple set contains at least one sample tuple from a corresponding base relation, and forming a join synopsis set for each selected base relation such that each join synopsis set contains a join synopsis for each sample tuple in a sample-tuple set. A join synopsis of a sample tuple is based on a join of the sample tuple and at least one descendent relation of the sample tuple. All join synopsis sets form a statistical summary of the database and are stored.

  Recently Added Patents
Image forming apparatus and system connectable with an authorization apparatus via a communications network, the image forming apparatus comprising an apparatus control section, an initial inq
Downlink scheduling in fractional frequency reuse (FFR) systems
Battery module
Method of optimizing air mover performance characteristics to minimize temperature variations in a computing system enclosure
Etch resistant clearcoat
Flexible circuit routing
Light fixture
  Randomly Featured Patents
Wiper device for wiping a vehicle windshield
Fixing apparatus having an induction heating control circuit
Process for the preparation of 2-amino-3-chlorobenzoic acid
Method for improved sputter etch processing
CMOS image sensor and method of fabricating the same
Substituted azetidinones
Pneumatic locking pin operating system for a trailer slider
Photographic material suited for use in diffusion transfer photography and method of diffusion transfer photography using such material
Inflatable partition for fighting mine fires
Printing color images visible under UV light on security documents and valuable articles