Set Valued Attributes


About three decades ago, when Codd (1970) invented the relational database model, it took the database world by storm. The enterprises that adapted it early won a large competitive edge. The past two decades have witnessed tremendous growth of relational database systems, and today the relational model is by far the dominant data model and is the foundation for leading DBMS products, including IBM DB2, Informix, Oracle, Sybase, and Microsoft SQL server. Relational databases have become a multibillion-dollar industry. However, as these databases grew so did the complexity of the data being stored in them with the emergence of a new class of applications. It quickly became apparent that relational databases suffer from various deficiencies and limitations. Relational database systems support a small, fixed collection of data types (e.g., integers, dates, strings) that has been proven to be adequate for traditional applications. With a new class of applications, more complex data needs to be handled. These complex data include hierarchical data of computer-aided design and modeling (CAD/CAM), multimedia data, and documents. Support for this kind of data requires the database to incorporate abstract data types and type constructors based on object-oriented concepts. This leads to the development of object database systems along two distinct paths:

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@inproceedings{Ramasamy2005SetVA, title={Set Valued Attributes}, author={Karthikeyan Ramasamy and Prasad Deshpande}, booktitle={Encyclopedia of Database Technologies and Applications}, year={2005} }