Incomplete Information in Relational Databases
Journal of the ACM (JACM)
A sound and sometimes complete query evaluation algorithm for relational databases with null values
Journal of the ACM (JACM)
Journal of Computer and System Sciences
Set-theoretic problems of null completion in relational databases
Information Processing Letters
Theoretical Computer Science
Null values in nested relational databases
Acta Informatica
Indefinite and maybe information in relational databases
ACM Transactions on Database Systems (TODS)
Relational database writings (1985–1989)
Relational database writings (1985–1989)
On the representation and querying of sets of possible worlds
Selected papers of the workshop on Deductive database theory
How to modify SQL queries in order to guarantee sure answers
ACM SIGMOD Record
Foundation for object/relational databases: the third manifesto
Foundation for object/relational databases: the third manifesto
On the foundations of the universal relation model
ACM Transactions on Database Systems (TODS)
A foundation of CODD's relational maybe-operations
ACM Transactions on Database Systems (TODS)
On semantic issues connected with incomplete information databases
ACM Transactions on Database Systems (TODS)
Extending the database relational model to capture more meaning
ACM Transactions on Database Systems (TODS)
On Databases with Incomplete Information
Journal of the ACM (JACM)
Four valued logic for relational database systems
ACM SIGMOD Record
Uncertainty Management in Information Systems: From Needs to Solutions
Uncertainty Management in Information Systems: From Needs to Solutions
Problem of Incomplete Information in Relational Databases
Problem of Incomplete Information in Relational Databases
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
A Guided Tour of Relational Databases and Beyond
A Guided Tour of Relational Databases and Beyond
Null values in data base management a denotational semantics approach
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
Improving semantic specification in a relational database
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
A systematic approach to relational database theory
SIGMOD '82 Proceedings of the 1982 ACM SIGMOD international conference on Management of data
Incomplete Relational Database Models Based on Intervals
IEEE Transactions on Knowledge and Data Engineering
Closed World Databases Opened Through Null Values
VLDB '88 Proceedings of the 14th International Conference on Very Large Data Bases
Query Evaluation with Null Values: How Complex is Completeness?
Proceedings of the Ninth Conference on Foundations of Software Technology and Theoretical Computer Science
A Semantics-based Approach to Design of Query Languages for Partial Information
Selected Papers from a Workshop on Semantics in Databases
Theory of Relational Databases
Theory of Relational Databases
On the Use of an Extended Relational Model to Handle Changing Incomplete Information
IEEE Transactions on Software Engineering
Foundational Challenges in Automated Semantic Web Data and Ontology Cleaning
IEEE Intelligent Systems
Semantics in Data and Knowledge Bases
Semantics in Data and Knowledge Bases
On the role of the complementation rule for data dependencies over incomplete relations
WoLLIC'10 Proceedings of the 17th international conference on Logic, language, information and computation
Generating operation specifications from UML class diagrams: A model transformation approach
Data & Knowledge Engineering
The Quadrupel --A Model for Automating Intermediary Selection in Supply Chain Management
Proceedings of the 2011 conference on Information Modelling and Knowledge Bases XXII
Integrity constraints in (conceptual) database models
The evolution of conceptual modeling
Foundations for a fourth normal form over SQL-Like databases
Conceptual Modelling and Its Theoretical Foundations
On Inferences of Full First-Order Hierarchical Decompositions
Fundamenta Informaticae - Logic, Language, Information and Computation
Deriving operation contracts from UML class diagrams
MODELS'07 Proceedings of the 10th international conference on Model Driven Engineering Languages and Systems
Hi-index | 0.00 |
Null values are ubiquitous in database applications. There is, however, no common agreement upon how to deal with null values, neither in practice nor in theory. In this paper, the null value problem is revisited with special emphasis on answers representing sure information with respect to possible world semantics. The focus is on the unknown and the no information interpretation of null values. A new semantics for the no information interpretation of nulls is proposed taking into account a problem arising in connection with the closed world assumption. Results are applied to the query language SQL.