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
Air filter
Bioelectric battery for implantable device applications
Data latch circuit and electronic device
Scalable packet processing systems and methods
Semiconductor device and method of manufacturing the same
Method and apparatus for managing communication services for user endpoint devices
  Randomly Featured Patents
Fuel assembly for a boiling water reactor
In-field installable closing delay cup
1,3-dimethyl-5-fluoro-pyrazole-4-carboxamide derivatives, their preparation and their use as microbicides
Hide stretching apparatus
System and method for assaying radiation
Etching process for making electrodes
Inviable phages, their production and DNA thereof
No skid brake control
Apparatus for shaping a spiral catalyst support
Physiologically active substance esterastin