Functional dependencies and constraints on Null values in database relations
Information and Control
Hierarchical schemata for relational databases
ACM Transactions on Database Systems (TODS)
Extending the database relational model to capture more meaning
ACM Transactions on Database Systems (TODS)
Synthesizing third normal form relations from functional dependencies
ACM Transactions on Database Systems (TODS)
Multivalued dependencies and a new normal form for relational databases
ACM Transactions on Database Systems (TODS)
On the Equivalence of Database Models
Journal of the ACM (JACM)
A complete axiomatization for functional and multivalued dependencies in database relations
SIGMOD '77 Proceedings of the 1977 ACM SIGMOD international conference on Management of data
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
Normal forms and relational database operators
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
Incomplete information and dependencies in relational databases
SIGMOD '83 Proceedings of the 1983 ACM SIGMOD international conference on Management of data
Towards the Reverse Engineering of Denormalized Relational Databases
ICDE '96 Proceedings of the Twelfth International Conference on Data Engineering
Extracting an Entity Relationship Schema from a Relational Database through Reverse Engineering
ER '94 Proceedings of the13th International Conference on the Entity-Relationship Approach
The VLDB Journal — The International Journal on Very Large Data Bases
ACM SIGMIS Database
Multivalued dependencies with null values in relational data bases
VLDB '79 Proceedings of the fifth international conference on Very Large Data Bases - Volume 5
Functional dependencies and incomplete information
VLDB '80 Proceedings of the sixth international conference on Very Large Data Bases - Volume 6
Automatic Extraction of Ontologies Wrapping Relational Data Sources
DEXA '09 Proceedings of the 20th International Conference on Database and Expert Systems Applications
When data dependencies over SQL tables meet the logics of paradox and S-3
Proceedings of the twenty-ninth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
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I present a novel methodology to automatically extract ontologies in the form of conceptual schemes characterizing raw data and then generate mappings linking the obtained ontology to raw data with the aim to extend Ontology Based Data Access to raw data. Additionally, I propose new definitions of functional and multivalued dependencies under SQL (in short, resp., nFDs and nMVDs) to model the semantics of raw data and to achieve raw data normalization. The main novelty in this work is to adapt existing techniques to deal with the case of data with missing or incomplete information that is witnessed through the presence of null values.