Passt nicht? Macht nichts! Bei uns ist die Rückgabe innerhalb von 30 Tagen möglich
Mit einem Geschenkgutschein können Sie nichts falsch machen. Der Beschenkte kann sich im Tausch gegen einen Geschenkgutschein etwas aus unserem Sortiment aussuchen.
30 Tage für die Rückgabe der Ware
This monograph provides a rigorous foundation for handling business and engineering data based on unnormalized relations. It can be used by practitioners, researchers, and students for self study or as a textbook. Both theoretical and practical aspects are discussed in this volume. In the relational data model, data objects are modeled as flat tables under a certain constraint. This constraint excludes nests of columns and/or rows from the relational data model. Therefore, extensions of the original relational data model have been proposed. In the nested table data model discussed here data are modeled as a collection of tables. This model is presented to provide a theoretical basis for modeling practical data in nested table forms. It is then applied to the design and implementation of a database workbench featuring an interactive manipulation of form-based documents. Nested tables are also used for application system generation. The book includes a useful overview of significant works relating to this important area of database research.