Query translation in a heterogeneous distributed database on hypergraph models
Query translation in a heterogeneous distributed database on hypergraph models
Query translation based on hypergraph models
The Computer Journal
Decompiling CODASYL DML into retional queries
ACM Transactions on Database Systems (TODS)
A simplied universal relation assumption and its properties
ACM Transactions on Database Systems (TODS)
On the Desirability of Acyclic Database Schemes
Journal of the ACM (JACM)
Degrees of acyclicity for hypergraphs and relational database schemes
Journal of the ACM (JACM)
Principles of Database Systems
Principles of Database Systems
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A translation process designed to translate queries between data models in a distributed environment is examined. Such a translation mechanism will enable the user to have access to the database resource in a distributed database for which different data base management systems coexist. The translation process is described and examples illustrating the process are given. The discussion has been limited to operating in the environment where the source and target database have the same semantics. Hypergraphs are used as the intermediate representation format for the query during the translation process. The semantics of both the source and target database are described in terms of hypergraphs. In addition, the hypergraph is extended to incorporate the operations of the data manipulation language in order to define a general model for query translation.