Database abstractions: aggregation and generalization
ACM Transactions on Database Systems (TODS)
Testing satisfaction of functional dependencies
Journal of the ACM (JACM)
Can we use the universal instance assumption without using nulls?
SIGMOD '81 Proceedings of the 1981 ACM SIGMOD international conference on Management of data
Toward logical data independence: a relational query language without relations
SIGMOD '82 Proceedings of the 1982 ACM SIGMOD international conference on Management of data
The universal instance and database design
The universal instance and database design
Resolving the query inference problem using Steiner trees
ACM Transactions on Database Systems (TODS)
On the properties and characterization of connection-trap-free schemes
PODS '86 Proceedings of the fifth ACM SIGACT-SIGMOD symposium on Principles of database systems
Explaining ambiguity in a formal query language
ACM Transactions on Database Systems (TODS)
On the foundations of the universal relation model
ACM Transactions on Database Systems (TODS)
Formal semantics for time in databases
ACM Transactions on Database Systems (TODS)
On Kent's “Consequences of assuming a universal relation” (Technical correspondance)
ACM Transactions on Database Systems (TODS)
The universal relation revisited (technical correspondence)
ACM Transactions on Database Systems (TODS)
SIGMOD '83 Proceedings of the 1983 ACM SIGMOD international conference on Management of data
Toward logical data independence: a relational query language without relations
SIGMOD '82 Proceedings of the 1982 ACM SIGMOD international conference on Management of data
Non first normal form relations to represent hierarchically organized data
PODS '84 Proceedings of the 3rd ACM SIGACT-SIGMOD symposium on Principles of database systems
Inclusion dependencies and the universal instance
PODS '83 Proceedings of the 2nd ACM SIGACT-SIGMOD symposium on Principles of database systems
PODS '83 Proceedings of the 2nd ACM SIGACT-SIGMOD symposium on Principles of database systems
Optimal computation of total projections with unions of simple chase join expressions
SIGMOD '84 Proceedings of the 1984 ACM SIGMOD international conference on Management of data
Universal Relation Views: A Pragmatic Approach
VLDB '83 Proceedings of the 9th International Conference on Very Large Data Bases
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We propose a universal relation scheme database model based on the assumption that there is a unique connection among any set of attributes in a relational database. We use the notion of object ([Sc],[MU]) to give a database designer the ability to control how connections in the database are to be made. We show how semantic considerations that follow naturally from the unique connection assumption constrain how objects and the underlying base relations must be syntactically related. We illustrate and motivate our definitions and constraints with several simple examples.