Equivalence of Relational Algebra and Relational Calculus Query Languages Having Aggregate Functions
Journal of the ACM (JACM)
Numeric Databases
SIGMOD '81 Proceedings of the 1981 ACM SIGMOD international conference on Management of data
Handling summary information in a database: derivability
SIGMOD '81 Proceedings of the 1981 ACM SIGMOD international conference on Management of data
An extension of relational algebra for summary tables
SSDBM'83 Proceedings of the 2nd international workshop on Proceedings of the Second International Workshop on Statistical Database Management
An algebra for statistical data
SSDBM'86 Proceedings of the 3rd international workshop on Statistical and scientific database management
Aggregate evaluability in statistical databases
VLDB '89 Proceedings of the 15th international conference on Very large data bases
A universal-scheme approach to statistical databases containing homogeneous summary tables
ACM Transactions on Database Systems (TODS)
Information synthesis in statistical databases
CIKM '95 Proceedings of the fourth international conference on Information and knowledge management
On the Data Model and Access Method of Summary Data Management
IEEE Transactions on Knowledge and Data Engineering
Query Evaluability in Statistical Databases
IEEE Transactions on Knowledge and Data Engineering
Temporal Probabilistic Concepts from Heterogeneous Data Sequences
Soft-Ware 2002 Proceedings of the First International Conference on Computing in an Imperfect World
SSDBM '96 Proceedings of the Eighth International Conference on Scientific and Statistical Database Management
Conceptual Clustering of Heterogeneous GeneExpression Sequences
Artificial Intelligence Review
Knowledge discovery by probabilistic clustering of distributed databases
Data & Knowledge Engineering
Temporal summary table management and graphic interface
SSDBM'1990 Proceedings of the 5th international conference on Statistical and Scientific Database Management
The classification problem with semantically heterogeneous data
SSDBM'1988 Proceedings of the 4th international conference on Statistical and Scientific Database Management
Answering constraint-based mining queries on itemsets using previous materialized results
Journal of Intelligent Information Systems
An analytical approach to the inference of summary data of additive type
Theoretical Computer Science
Two approaches to the integration of heterogeneous data warehouses
Distributed and Parallel Databases
Integrating semantically heterogeneous aggregate views of distributed databases
Distributed and Parallel Databases
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Given a statistical database consisting of two summary tables based on a common but not identical classification criterion (e.g., two geographical partitionings of a country) there are additional summary tables that are derivable in the sense that they are uniquely (i.e., with no uncertainty) determined by the tables given. Derivable tables encompass not only, of course, “less detailed” tables (that is, aggregated data) but also “more detailed” tables (that is, disaggregated data). Tables of the second type can be explicitly constructed by using a “procedure of data refinement” based on the graph representation of the correspondences between the categories of the two classification systems given in some cases, that is, when such a graph representation meets the acyclicity condition, the underlying database is “equivalent” to a single table (called representative table) and then a necessary and sufficient condition for a table to be derivable can be stated.