Entity Relationship Diagram - ERD - Software for Design
Chen ER Diagrams

One of the methods actively used in a real design of database structure is semantic modeling, which is a modeling of the data structure, based on the meaning of these data. Various types of ER diagrams are used as the tool of semantic modeling.

The first version of the entity-relationship model was proposed in 1976 by Peter Chen. In the future, many authors have developed their own versions of these models (Martin notation, IDEF1X notation, Barker notation, etc.). Irrespective from the notation, all versions of Entity-relationship diagrams are based on the same idea - image is always more visual than text description. ER diagrams use a graphical representation of the entity domain, their properties (attributes), and the relationships between entities.

The Entity-Relationship Diagram (ERD) solution from ConceptDraw Solution Park extends ConceptDraw PRO vector graphics and diagramming software with the ability to describe a database using the Entity-Relationship (Chen) model. Use it for design your ERDs and verify that ConceptDraw PRO offers the best ERD diagrams software tools for design element Chen notation.

Entity Relationship Diagram Software, Design Elements - Chen (Windows, Macintosh)

Example 1. Entity Relationship Diagram Software
Design Elements — Chen (Windows, Macintosh).

Entity-Relationship Diagram (ERD) solution offers the ERD Chen's Notation library with variety of ERD symbols for Chen notation. Simply drag the predesigned ERD objects from the library, arrange them, type the text and title to get the excellent result – your own ER Diagram in minutes. It’s a fastest way of drawing, and the most important – you don’t need to be the painter for this.

Entity-Relationship Diagram Solution in ConceptDraw STORE

Example 2. Entity-Relationship Diagram Solution in ConceptDraw STORE

You can also use the ready samples or templates offered by Entity-Relationship Diagram (ERD) solution in ConceptDraw STORE as the base for your own diagrams.

ER Diagram, Chen Notation

Example 3. ER Diagram, Chen Notation

The samples you see on this page were created in ConceptDraw PRO software in Mac OS X and Windows 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 PRO to create quick and easy your own Entity-Relationship Diagrams 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 PRO v9.5 or later users.

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Design Element: Chen for Entity Relationship Diagram - ERD

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.ERD. Entity Relationship Diagram, Design Elements - Chen (Win Mac)
Picture: Design Element: Chen for Entity Relationship Diagram - ERD
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Entity Relationship Diagram Examples

An abstract representation is usually the first thing you will need while developing a database. To understand the ways that databases are structured, you should look through entity-relationship diagram examples and see the notations features and attributes. With an entity-relationship model you can describe a database of any complexity. This Entity-relationship diagram is a tool for software developers. It enables every element of database to be managed, communicated and tested before release. This ERD was created using symbols advocated by Chen's notation. Because of a linguistic origin of the Chen’s notation, the boxes representing entities could be interpreted as nouns, and the relationships between them are in verb form, shown on a diagram as a diamond.Entity Relationship Diagram Examples
Picture: Entity Relationship Diagram Examples
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Entity Relationship Software

Both Crow’s Foot and Chen’s notations are used to build database models. Each of them has its’ own features, and if you use a proper entity relationship diagram software, you’ll be able to create diagrams of any notation. Database model with clearly defined entities and relationships between them facilitates further work greatly. This ERD represents the model of Employee Certification Entity. The entity-relationship diagram is a visual instrument of database software development. It is used to structure data and to define the relationships between structured data groups. This ERD was designed with a help of ConceptDraw Entity-Relationship Diagram (ERD) solution. The solution supports the both basic ERD notations used to describe the structure of database: Chen's and Crow’s Foot notations.Entity Relationship Software. Crow
Picture: Entity Relationship Software
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IDEF1X Standard

Use Case Diagrams technology. IDEF1x standard - for work with relational data bases. IDEF1x standard is meant for constructing of conceptual schemes which represent the structure of data in the context of the concerned system, for example, a commercial organization.IDEF1x standard diagram example
Picture: IDEF1X Standard

Components of ER Diagram

It is easy to recreate any informational system structure using diagrams. There are three main components of any ER diagram: entity, attribute and relationship. Basing on these three components, one can define other, less used elements, such as weak entity or relationship, derived attribute, recursive relationship etc. This is the set of graphic elements of ERD Chen's notation. This ERD notation is used to represent an entity–relationship models. It involves the set of geometric forms: rectangles - depicting entities, ovals - representing attributes and diamonds depicting relationships assigned for first-class objects, that can have relationships and attributes of their own. Connections are displayed with arrowed lines. It is known that the Chen's ERD notation is used to show a detailed view of entities and relationships. ConceptDraw Entity-Relationship Diagram solution from the Software Development section of Solution Park provides the ability to create ERD of database structure for software development purposes using the Chen’s notation elements.Components of ER Diagram
Picture: Components of ER Diagram
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Data modeling with ConceptDraw PRO

Data modelling will help you to study and analyze business processes in your organization for optimization and increase of effectiveness and production.
Picture: Data modeling with ConceptDraw PRO

Martin ERD Diagram

The vector stencils library Crow's Foot Notation from the solution Entity-Relationship Diagrams (ERD) contains specific symbols of the Crow's foot notation such as relationship symbols and entity symbols for ConceptDraw PRO diagramming and vector drawing software. The Entity-Relationship Diagrams (ERD) solution is contained in the Software Development area of ConceptDraw Solution Park.Martin ERD Diagram - Sales
Picture: Martin ERD Diagram
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Wireframe Examples

ConceptDraw PRO is a powerful diagramming and vector drawing software. Extended with Website Wireframe solution from the Software Development area, ConceptDraw PRO became the ideal software for prototype and design professional looking websites wireframes. Website Wireframe solution offers at your disposal wide variety of wireframe examples and samples which confirm this.Wireframe Examples
Picture: Wireframe Examples
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Design Element: Crows Foot for Entity Relationship Diagram - ERD

The first thing that usually comes to mind when talking about database models is ER-diagrams, and the ways to create them. The second most recognizable notation is the Crow’s Foot, which visually differs from Chen’s notation. Actually, it doesn’t matter which notation you’ll use for your entity relationship diagram (ERD), but the content is what matters. When designing an Entity-Relationship Diagram one need to use a certain notated symbols that were developed and standardized especially for databases description. First of them - the Chen’s notation had a linguistic origin. It includes rectangle boxes to show entities that may be described as nouns, and the relationships between them described as verbs depicted in a form of diamond. Finally the Chen’s notation was simplified up to the Crow’s Foot notation. It represents a relationship as labeled line. It is precisely this notation is shown in the given figure. ConceptDraw PRO together with its Entity-Relationship Diagram (ERD) solution is designed to support professionals who deals with creating ER diagrams using the element of both - Chen’s and Crow's Foot notations.Entity Relationship Diagram, Design Elements - Crows Foot  (Win Mac)
Picture: Design Element: Crows Foot for Entity Relationship Diagram - ERD
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ER diagram tool for OS X

ER diagram is the most popular database design tool which lets create graphical representations of database tables, their columns and also relationships. As for the Mac users, they are very interested in powerful database diagramming tools and ER diagram tool for OS X to design professional looking E-R Diagrams and ERD drawings. ConceptDraw PRO software on Mac OS X gives the ability to easy draw ERDs.ER diagram tool for OS X
Picture: ER diagram tool for OS X
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