Accession Number : ADA135707

Title :   Universal Relation Database Systems.

Descriptive Note : Annual rept. 1 Sep 82-31 Aug 83,


Personal Author(s) : Ullman,J D

PDF Url : ADA135707

Report Date : Aug 1983

Pagination or Media Count : 7

Abstract : The query facility for their universal relation database system is now working. The fundamental paper unifying ideas on what a UR system can and should be has been published. A paper surveying developments in the field of universal relation systems was invited for the triennial IFIP Congress and was delivered in September. Some initial results on logical theories applied to the problem of updating views have been obtained. There have been a number of developments concerning inference of inclusion dependencies and on the complexity of deciding certain properties of data base schemes. Some interesting results on the difficulty of obtaining hash functions that work well for particular sets of data have been obtained and won an award. (Author)

Descriptors :   *Data management, *Data bases, Computer logic, Semantics, Parsers, Systems engineering, Information retrieval, Operational effectiveness, Research management, Reports

Subject Categories : Information Science

Distribution Statement : APPROVED FOR PUBLIC RELEASE