NDLI: Querying Incomplete Information Using Bag Relational Algebra

Content Provider	IEEE Xplore Digital Library
Author	Stanchev, L.
Copyright Year	2010
Abstract	In the paper, we introduce bag relational algebra with grouping and aggregation overa particular representation of incomplete information called c-tables, which wasfirst introduced byGrahne in 1984.In order for this algebra to be closed and ``well-defined'', we adopt the closed world assumptionas described by Reiter in 1978 and extend the tuple and table conditions to linear ones.It turns out that query answering overthe described extension remains polynomial timerelative to the size of the certain information. Therefore, the proposed algebra can be implemented as partof a SQL engine that can query incomplete information. The execution time will be acceptable as long as the size of the incomplete information issmall relative to the total size of the database.
Starting Page	110
Ending Page	119
File Size	363605
Page Count	10
File Format	PDF
ISBN	9781424456888
e-ISBN	9781424456895
DOI	10.1109/eKNOW.2010.9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-02-10
Publisher Place	Netherland Antilles
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	incomplete information Relational databases Knowledge management Information management c-tables Engines Cost accounting Computer science Algebra Polynomials Database systems relational model null values
Content Type	Text
Resource Type	Article

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