VAGUE: a user interface to relational databases that permits vague queries
ACM Transactions on Information Systems (TOIS)
Relational database theory
Fuzzy sets and fuzzy logic: theory and applications
Fuzzy sets and fuzzy logic: theory and applications
MARCO: MAp Retrieval by COntent
IEEE Transactions on Pattern Analysis and Machine Intelligence
Combining fuzzy information from multiple systems (extended abstract)
PODS '96 Proceedings of the fifteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
A probabilistic relational algebra for the integration of information retrieval and database systems
ACM Transactions on Information Systems (TOIS)
On saying “Enough already!” in SQL
SIGMOD '97 Proceedings of the 1997 ACM SIGMOD international conference on Management of data
Querying multimedia data from multiple repositories by content: the Garlic project
Proceedings of the third IFIP WG2.6 working conference on Visual database systems 3 (VDB-3)
Continuous versus exclusive classification for fingerprint retrieval
Pattern Recognition Letters
Uncertainty in a nested relational database model
Data & Knowledge Engineering
Similarity-based ranking and query processing in multimedia databases
Data & Knowledge Engineering
Fuzzy query languages for multimedia data
Design and management of multimedia information systems
Optimal aggregation algorithms for middleware
PODS '01 Proceedings of the twentieth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
PREFER: a system for the efficient execution of multi-parametric ranked queries
SIGMOD '01 Proceedings of the 2001 ACM SIGMOD international conference on Management of data
Searching Multimedia Databases by Content
Searching Multimedia Databases by Content
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
Minimal probing: supporting expensive predicates for top-k queries
Proceedings of the 2002 ACM SIGMOD international conference on Management of data
SilkRoute: A framework for publishing relational data in XML
ACM Transactions on Database Systems (TODS)
Supporting Ranked Boolean Similarity Queries in MARS
IEEE Transactions on Knowledge and Data Engineering
Efficient Processing of Nested Fuzzy SQL Queries in a Fuzzy Database
IEEE Transactions on Knowledge and Data Engineering
An Approach to Integrating Query Refinement in SQL
EDBT '02 Proceedings of the 8th International Conference on Extending Database Technology: Advances in Database Technology
Incorporating User Preferences in Multimedia Queries
ICDT '97 Proceedings of the 6th International Conference on Database Theory
On Efficiently Implementing SchemaSQL on an SQL Database System
VLDB '99 Proceedings of the 25th International Conference on Very Large Data Bases
Aggregate-Query Processing in Data Warehousing Environments
VLDB '95 Proceedings of the 21th International Conference on Very Large Data Bases
Image Categorization Using Texture Features
ICDAR '97 Proceedings of the 4th International Conference on Document Analysis and Recognition
The VLDB Journal — The International Journal on Very Large Data Bases
A Declarative Language for Similarity Queries
KDEX '99 Proceedings of the 1999 Workshop on Knowledge and Data Engineering Exchange
Fuzzy query translation for relational database systems
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics
SQLf: a relational database language for fuzzy querying
IEEE Transactions on Fuzzy Systems
SRI: exploiting semantic information for effective query routing in a PDMS
WIDM '06 Proceedings of the 8th annual ACM international workshop on Web information and data management
Relational algebra for ranked tables with similarities: properties and implementation
IDA'07 Proceedings of the 7th international conference on Intelligent data analysis
OLAP query reformulation in peer-to-peer data warehousing
Information Systems
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In recent years, the availability of complex data repositories (e.g., multimedia, genomic, semistructured databases) has paved the way to new potentials as to data querying. In this scenario, similarity and fuzzy techniques have proven to be successful principles for effective data retrieval. However, most proposals are domain specific and lack of a general and integrated approach to deal with generalized complex queries, i.e., queries where multiple conditions are expressed, possibly on complex as well as on traditional data. To overcome such limitations, much work has been devoted to the development of middleware systems to support query processing on multiple repositories. On a similar line, in this paper we present a formal framework to permeate complex similarity and fuzzy queries within a relational database system. As an example, we focus on multimedia data, which is represented in an integrated view with common database data. We have designed an application layer that relies on an algebraic query language, extended with MM-tailored operators, and that maps complex similarity and fuzzy queries to standard SQL statements that can be processed by a relational database system, exploiting standard facilities of modern extensible RDBMS. To show the applicability of our proposal, we implemented a prototype that provides the user with rich query capabilities, ranging from traditional database queries to complex queries gathering a mixture of Boolean, similarity, and fuzzy predicates on the data.