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
Electrifying roller
Controlling access to resources on a network
Inkjet ink
Methods and apparatus to provide haptic feedback
Device, information processing method, and computer-readable storage medium
Circuit board and display panel assembly having the same
Water bottle warning triangle
  Randomly Featured Patents
Heat transfer device
Method of cooling the continuous shielding wire fed to the welding rollers of machines for seam-welding discrete lengths of tube
Master-slave manipulator system
Electrical resistance unit for ignitor plugs
Device for lifting boards
Transfer film
Carrier projectile
System for improving an image displayed on a display
Document handling apparatus
Keyboard for a personal computer