An introduction to database systems: vol. I (4th ed.)
An introduction to database systems: vol. I (4th ed.)
The relational model with relation-valued attributes
Information Systems
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SIGMOD '86 Proceedings of the 1986 ACM SIGMOD international conference on Management of data
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ACM Transactions on Database Systems (TODS)
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ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
Database abstractions: aggregation and generalization
ACM Transactions on Database Systems (TODS)
Database abstractions: aggregation
Communications of the ACM
On extending the functions of a relational database system
SIGMOD '82 Proceedings of the 1982 ACM SIGMOD international conference on Management of data
Inferring aggregation hierarchies for integration of data marts
DEXA'10 Proceedings of the 21st international conference on Database and expert systems applications: Part II
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Integrated database support is an essential part in Office Automation. Because of the variety of objects, their relationships and operations, more sophisticated data modelling concepts such as aggregation and long fields, cross references, aggregation hierarchies, and generalizations are needed. In this paper, we show their importance to Office Automation. Because long fields and aggregation are already supported by existing data models, we focus on the two data abstraction concepts: aggregation hierarchy and generalization. Besides structural aspects a restricted set of operations is defined. Then we discuss an implementation on the basis of a relational engineering prototype database system, that already supports long fields, aggregation and aggregation hierarchies.