Abstract
In recent years, a lot of variety of Database Management Systems have been created. Despite of the considerable progress in this area, the most popular are still relational databases (RDB). Designing a relational database requires a lot of experience - not only in computer science. The initial database structure depends on the current customer expectations. These expectations, however, change during operation of the application. Changes in the application usually lead to changes of table structures or field types in the working database. This induce the use of redundant storage space on unneeded data or loss of data archives. The article presents the concept of flexible structures in relational databases. These structures enable the implementation of inheritance, creation of polymorphic tuples within one entity, and the creation of attributes with a variable type of value. Along with the description of structures, a modified version of SQL queries that operate on these structures was proposed.
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Pokuta, W. (2020). The Concept of a Flexible Database - Implementation of Inheritance and Polymorphism. In: Borzemski, L., Świątek, J., Wilimowska, Z. (eds) Information Systems Architecture and Technology: Proceedings of 40th Anniversary International Conference on Information Systems Architecture and Technology – ISAT 2019. ISAT 2019. Advances in Intelligent Systems and Computing, vol 1050. Springer, Cham. https://doi.org/10.1007/978-3-030-30440-9_12
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DOI: https://doi.org/10.1007/978-3-030-30440-9_12
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