Data structure diagram
A data structure diagram ( DSD ) is a data model for the description of conceptual schemes, which provides graphical notations for the representation of entities, their relationships and also constraints .
The basic graphical elements of the data structure diagram are rectangles used to represent entities and arrows to represent relationships.
Overview
The data structure diagram is a type of diagram that can be used to visualize the structure of the data elements in a data dictionary . The DSD is a graphical alternative to the specifications within entries in the data dictionary.
The focus of the data structure diagram is on the relationships of the elements within an entity.
Bachman notation
An alternative name for data structure diagram is Bachman diagram - a notation that was used to model the data with a network or relational data model, whereby the data model is separated from the type of storage in the system. The diagram is named after the database pioneer Charles Bachman and was mainly used in software design.
See also
literature
- Charles Bachman . Data structure diagrams . Data Base, 1969, 1 (2): 4-10.
- Tom DeMarco . Structured Analysis and System Specification . ISBN 0-13-854380-1 . Prentice Hall. May 11, 1979.
- Edward Yourdon. Modern Structured Analysis . ISBN 0-13-598624-9 . Prentice Hall. August 1, 1988; is available on the Structured Analysis Wiki .
Web links
Individual evidence
- ↑ Data Integration Glossary ( Memento of the original dated February 18, 2012 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , US Department of Transportation, August 2001.
- ↑ IRS Resources . Part 2. Information Technology, Chapter 5. Systems Development, Section 13. Database Design Techniques and Deliverables. Retrieved July 2, 2009.
