Semantics and implementation of schema evolution in object-oriented databases
SIGMOD '87 Proceedings of the 1987 ACM SIGMOD international conference on Management of data
O2, an object-oriented data model
SIGMOD '88 Proceedings of the 1988 ACM SIGMOD international conference on Management of data
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
A model of queries for object-oriented databases
VLDB '89 Proceedings of the 15th international conference on Very large data bases
OQL: a query language for manipulating object-oriented databases
VLDB '89 Proceedings of the 15th international conference on Very large data bases
A general framework for the optimization of object-oriented queries
SIGMOD '92 Proceedings of the 1992 ACM SIGMOD international conference on Management of data
Querying object-oriented databases
SIGMOD '92 Proceedings of the 1992 ACM SIGMOD international conference on Management of data
Object-oriented modeling and design
Object-oriented modeling and design
Object-oriented analysis (2nd ed.)
Object-oriented analysis (2nd ed.)
Introduction to object-oriented databases
Introduction to object-oriented databases
The object database standard: ODMG 2.0
The object database standard: ODMG 2.0
A taxonomy for object-oriented queries
Current trends in data management
Object Data Management: Object-Oriented and Extended
Object Data Management: Object-Oriented and Extended
Object-Oriented Database Systems: Concepts and Architectures
Object-Oriented Database Systems: Concepts and Architectures
Object-Oriented Query Languages: The Notion and the Issues
IEEE Transactions on Knowledge and Data Engineering
Queries in Object-Oriented Databases
Proceedings of the Fourth International Conference on Data Engineering
Object Comprehensions: A Query Notation for Object-Oriented Databases
BNCOD 12 Proceedings of the 12th British National Conference on Databases: Directions in Databases
Queries in Object-Oriented Database Systems
CIKM '92 Selected Papers from the First International Conference on Information and Knowledge Management, Expanding the Definition of Database
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Query language and querying facilities are critical factors for wide acceptance of Object-Oriented Database Management Systems (OODBMS) in the market. In this paper, we focus on query model on an aggregation hierarchy. We call this query "Aggregation Query". Query on an aggregation hierarchy is unique and differs from general query on association relationships. The latter is often known as path expression query. The difference is analogous to the distinction between association and aggregation in object modelling. In our proposal, we present three important elements of aggregation query, particularly (i) aggregation query hierarchy, (ii) shorthand path expression for aggregation query utility, and (iii) retrieving aggregation tree. Whilst the first element above is adopted from path expression queries, the second element is an extension to general path expression query, and the third element is unique to aggregation, as aggregation resembles a Part-Of relationship, which is more specialized than association relationships.