Queries and query processing in object-oriented database systems
ACM Transactions on Information Systems (TOIS)
LLO: an object-oriented deductive language with methods and method inheritance
SIGMOD '91 Proceedings of the 1991 ACM SIGMOD international conference on Management of data
Schema transformation without database reorganization
ACM SIGMOD Record
Second-order signature: a tool for specifying data models, query processing, and optimization
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
An extensible query model and its languages for a uniform behavioral object management system
CIKM '93 Proceedings of the second international conference on Information and knowledge management
Algebraic equivalences among nested relational expressions
CIKM '94 Proceedings of the third international conference on Information and knowledge management
Object orientation in multidatabase systems
ACM Computing Surveys (CSUR)
An equational object-oriented data model and its data-parallel query language
Proceedings of the 11th ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications
View Operations on Objects with Roles for a Statically Typed Database Language
IEEE Transactions on Knowledge and Data Engineering
Multi-valued dependencies in the presence of lists
PODS '04 Proceedings of the twenty-third ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
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The relational model and its extensions are often considered incompatible with object-orientation. However, on the one hand nested relations provide the complex object features demanded by object models. Particularly, powerful query languages exploit the complex data structure while keeping the advantages of the declarative, set-oriented paradigm. On the other hand, object models provide semantically rich constructs for advanced modeling, and abstractions of operations as well as data. In this paper, we show an evolutionary path from relational, essentially nested relational, to object-oriented data models and query languages. Basically, allowing nested relation schemes to be recursively defined yields the necessary w.r.t. structure. The query language, i.e., nested relational algebra, carries over to this “network” model. As a first step towards the object-oriented integration of cooperative systems, different views onto the objects have to be supported. We present a powerful view definition facility that basically allows object views as well as relational views to be defined in our object algebra.