Abstract
We have seen that a Data Model comprises the Data Description facilities (through the DDL) and the Data Manipulation facilities (through the DML). As explained in Chapter 2, a DDL is used to specify the schema for the database — its entities can be created, and its attributes, domains, and keys can be defined through language statements of the DDL. The structure of the entities is defined, but not the data within them. DDL thus supports only the declaration of the database structure.
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© 1998 Springer-Verlag Berlin Heidelberg
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Maurer, H., Scherbakov, N., Halim, Z., Razak, Z. (1998). Data Updating Facilities. In: From Databases to Hypermedia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-58763-4_3
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DOI: https://doi.org/10.1007/978-3-642-58763-4_3
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-63754-7
Online ISBN: 978-3-642-58763-4
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