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

Image Number 8 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
Method for manufacturing semiconductor element and semiconductor device, and deposition apparatus
Semiconductor chip, stack module, and memory card
Film-forming resins as a carrier for topical application of pharmacologically active agents
Method and apparatus for communication channel error rate estimation
Apparatus, method and program for image receipt, processing, conversion, and delivery to and from a plurality of external apparatuses
Identification of protected content in e-mail messages
Clock face
  Randomly Featured Patents
Pseudo-capacitor device for aqueous electrolytes
Silver halide color photographic material
Photo-stimulable image plate restoration assembly
Pool table
Financial advisory system
Maintaining planarity in polyester film during uniform temperature heat relaxation
Thermoplastic ternary molding composition of polyurethane polyphosphonates and polycarbonate resins
Cosmetic container
Method for producing a two component polymeric tape
Light emitting diode bulb connector