Design Element: Chen
for Entity Relationship Diagram - ERD
Entity-relationship diagrams (ERDs) are intended for the development of data models and provide a standard method for determining data and relationships between them. The first notation for ERD was introduced by Chen and has been further developed by Barker.
Chen notation provides a rich set of data modeling tools, including essentially the ERD, as well as the attribute diagrams and decomposition charts. These diagram techniques are used primarily for designing relational databases.
The entity is a set of instances of real or abstract objects (people, events, conditions, ideas, items, etc.) that have common attributes or characteristics. Any system object can be represented by only one entity, that must to be uniquely identified. In this case the entity name must reflect the type or class of the object, not a specific instance. The relationship in the most general form represents a link between two or more entities.
In other words, the entities are the basic types of information stored in the database, and the relationships show how these types of data are interrelated with each other.
Entity-Relationship Diagram (ERD) solution from Software Development area of ConceptDraw Solution Park provides the libraries with predesigned set of ERD diagram design element Chen corresponding entities and relationships.
Example 1. Design Elements — Chen's (Mac OS X, Windows) for Entity Relationship Diagrams
As well as two libraries of vector stencils with entity relationship symbols, the Entity-Relationship Diagram (ERD) solution provides entity relationship diagram samples, examples, and templates. All they you can find at ConceptDraw STORE and use as the base for your own ER Diagrams.
Example 2. Entity-Relationship Diagrams - Chen Notation
The samples you see on this page were created in ConceptDraw DIAGRAM software using the Entity-Relationship Diagram (ERD) solution and show the ER Diagrams created with Chen notation. An experienced user spent 10 minutes creating these samples.
Use the Entity-Relationship Diagram (ERD) Solution for ConceptDraw DIAGRAM to create quick and easy your own ERDs using the Chen and Crow's Foot notations.
All source documents are vector graphic documents. They are available for reviewing, modifying, or converting to a variety of formats (PDF file, MS PowerPoint, MS Visio, and many other graphic formats) from the ConceptDraw STORE. The Entity-Relationship Diagram (ERD) Solution is available for all ConceptDraw DIAGRAM or later users.
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It is very difficult to get into database model idea without any examples. To create one, you can use Chen’s notation for Entity Relationship Diagrams (ERD) and try to see all the peculiarities yourself. This notation describes entities and relations as basic geometric shapes like rectangles and diamonds.
Chen notation for Entity-relationship diagrams is used for designing relational databases. It depicts the database entities as a set of subjects. For example events, people, ideas, etc. All entities has common characteristics (attributes). Any object of the system is identified as the sole and unique. The name of entity should indicate the class or type of the the whole object, not a given example. The connection commonly represents a relationship between entities. Conceptdraw Entity-Relationship Diagrams (ERD) solution provides the libraries with ready-to-use ERD element fitting Chen's notation objects and relationships.
Picture: Design Element: Chen for Entity Relationship Diagram - ERD
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