Constraint-generating dependencies
Journal of Computer and System Sciences
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
Logical Database Design with Inclusion Dependencies
Proceedings of the Eighth International Conference on Data Engineering
Inclusion Dependencies in Database Design
Proceedings of the Second International Conference on Data Engineering
The Theory of Data Dependencies - An Overview
Proceedings of the 11th Colloquium on Automata, Languages and Programming
Reasoning with Disjunctive Constrained Tuple-Generating Dependencies
DEXA '01 Proceedings of the 12th International Conference on Database and Expert Systems Applications
A normal form for XML documents
ACM Transactions on Database Systems (TODS)
Strong functional dependencies and their application to normal forms in XML
ACM Transactions on Database Systems (TODS)
Theory of Relational Databases
Theory of Relational Databases
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In relational database systems, traditional normalization techniques (eg, BCNF, 4NF) remove data redundancies from a single relation, but can not detect and remove redundancies across multiple relations. However, redundancies among multiple relations are abundant especially in integrated databases. In this paper, we first propose to detect such data redundancies using equality-generating dependencies (EGDs) and propose an extended normal form (ENF) of relational database schema with respect to EGDs. We show that a database has no potential data redundancies with respect to EGDs if and only if the schema is in ENF. For a common special class of EGDs, we provide a set of sound and complete inference rules. A normalization process is presented to losslessly transform a relational database schema to one in ENF. We then extend our EGDs and ENF to XML data, and show how similar data redundancy problems can be detected for data-centric XML documents.