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Null values in object bases: pulling out the head from the sand (1996).
| Content Provider | CiteSeerX |
|---|---|
| Author | Subieta, Kazimierz Kambayashi, Yahiko Leszczylowski, Jacek Ulidowski, Irek |
| Abstract | We address the problem of null values and other forms of irregular data in object-oriented databases. This problem is important because of such aspects of modern database technologies as conceptual modeling, database design, schema evolution, interoperability, integration of data from heterogeneous sources, data warehousing, as well as reliability, maintenance and documentation of databases and application programs. We analyze various approaches to null values postulated by the relational school, in particular the SQL approach and the default values. In response we propose a new universal approach to irregular data based on the idea of absent objects. We believe that our method solves the difficulties encountered in SQL. Moreover, it covers union types and can be smoothly combined with the idea of default values. We discuss the implications of the approach to query languages, and briefly introduce a new approach to polymorphic typing of irregular data. 1 Introduction The phenomenon of... |
| File Format | |
| Publisher Date | 1996-01-01 |
| Access Restriction | Open |
| Subject Keyword | Null Value Object Base Default Value Irregular Data Conceptual Modeling Various Approach Modern Database Technology Database Design Absent Object Application Program New Universal Approach New Approach Data Warehousing Union Type Schema Evolution Object-oriented Database Sql Approach Relational School Heterogeneous Source |
| Content Type | Text |
