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• W2532628700 abstract "This thesis investigates issues concerned with complex object representation, object oriented databases, reasoning on database objects and suitable languages as an interface to complex databases. Database theory has been studied and developed mainly from the perspectives of aggregation, logical dependencies, normal forms and logical query manipulations on flat untypes databases.A basic motivation for our work has been, (a) the need for better data abstraction facilities and adequate data types to represent a wide range of objects in the database and (b) existing mismatch between a database and a high level programming language. To bridge the gap between databases and high level programming languages, we have studied ways to augment the semantic power of databases so that various object types, subtype-supertype relationships and semantics of objects can be stored. On the other hand, the expressive power of query languages needs to be developed further in order to offer a better high level interface for the manipulation of data stored at a higher level of abstraction. This thesis accomplishes the following: (a) We propose an extension of the relational database. This new model has a layered architecture and maintains subtype-supertype links in a complete type lattice over relations. A record in a subtype relation can now inherit attributes from supertype relations in the lattice. Furthermore, these inherited attributes have the ability to be stored in a higher order relation with a generalization over the subtype relation(s). Such a layered architecture of relational database model is achieved by combining the concepts of aggregation and generalization over database objects. Inheritance of attributes from a higher order relation to another relation is allowed for relations which are connected by an Is-A link (similar to Is-A links in semantic networks). (b) In this thesis, we also describe the design of a logical query language on top of the layered relational database which captures the lattice. This language is similar to typed prolog and its operational semantics are defined to be an amalgamation of reduction and resolution techniques. While resolution is known as operational semantics of logical languages like prolog, reduction is known for functional languages. Recent investigations have shown that incremental reduction of functional languages is similar to resolution. The logical query language proposed in this thesis incorporates the ideal of incremental reduction and an Is-A clause which give the power to navigate through a lattice of relations and to resolve a variety of goals." @default.
• W2532628700 created "2016-10-28" @default.
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• W2532628700 date "1989-01-03" @default.
• W2532628700 modified "2023-09-26" @default.
• W2532628700 title "Architecture and language for a layered relational database" @default.
• W2532628700 hasPublicationYear "1989" @default.
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