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are specified inside the entity boxes rather than outside of them, while relationships are drawn as boxes composed of attributes which specify the constraints that bind entities together. DSDs differ from the E–R model in that the E–R model focuses on the relationships between different entities,
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of every key in that relation. The coupling between the relations is based on accordant attributes. For every relation, a rectangle has to be drawn and every coupling is illustrated by a line that connects the relations. On the edge of each line, arrows indicate the cardinality:
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264:. Part 2. Information Technology, Chapter 5. Systems Development, Section 13. Database Design Techniques and Deliverables. Retrieved 2 July 2009.
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which represent entities. Arrow symbols represent relationships. Data structure diagrams are most useful for documenting complex data entities.
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from the way the data is stored in the system. The model is named after database pioneer
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A Bachman diagram is a certain type of data structure diagram, and is used to design the
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In a relational model, a relation is the cohesion of attributes that are fully and not
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whereas DSDs focus on the relationships of the elements within an entity.
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104:. The data structure diagram is a graphical alternative to the
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with a network or relational "logical" model, separating the
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that are placed on them. It is an older alternative to the
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The data structure diagrams is a predecessor of the
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specifications within such data dictionary entries.
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143:Illustration of set type using a Bachman diagram
72:The basic graphic notation elements of DSDs are
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96:type that is used to depict the structure of
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294:Structured Analysis and System Specification
88:Data structure diagram and a data dictionary
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33:Example of a data structure diagram
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304:. Prentice Hall. 11 May 1979.
286:. Data Base, 1969, 1(2):4–10.
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219:Entity-relationship diagram
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312:Modern Structured Analysis
519:Business process modeling
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243:Data Integration Glossary
224:Unified Modeling Language
209:Control structure diagram
113:entity–relationship model
67:entity–relationship model
324:Structured Analysis Wiki
283:Data structure diagrams
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115:(E–R model). In DSDs,
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39:data structure diagram
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49:of a certain kind of
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529:Enterprise modelling
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171:functional dependent
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278:Charles W. Bachman
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361:Data model
230:References
169:transitive
153:data model
117:attributes
61:, and the
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