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1 Journal of Medical Informatics & Technologies

1 2004

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Data cleaning of medical data sets

Widera A., Widera M., Feige D., Horoba K., Stankiewicz A.

Journal of Medical Informatics & Technologies

2004

Vol. 8

MM129--140

Each database system evolves during the time. If the primary database schema was designed only to store the limited scope of abstraction classes then the database system improvement process is performed in traditional way (using alter table, update table and create table commands). Anyhow it could be impossible, from the engineering point of view, or too expensive from the economic point of view. Transferring the data from one database schema to another database schema one has to perform an additional step called Data Cleaning. This paper present a basic sketch for the data cleaning theory based on the materialised views idea and corresponding data cleaning environment. The proposed methodology is suitable not only for the data verification but also for the reengineering of the broken references between data fields, recreation of missing rows and data types conversion.