Entity Relationship Diagram Examples

Crow’s Foot and Chen's notation examples

Create an Entity-Relationship (ER) model is to visually represent the structure of a business database, where data equates to entities (or objects) that are linked by defined relationships expressing dependencies and requirements. By nature it is an abstract visualization, the first step in the design process towards creating a logical and functional database.

ConceptDraw PRO diagramming and vector drawing software gives the ability to describe a database using the Entity-Relationship model. Entity-Relationship Diagram (ERD) solution from the Software Development area supplies the ConceptDraw PRO with icons advocated by Chen's and Crow’s Foot notation that can be used when describing a database.

Entity-Relationship Diagram (ERD) solution contains incredibly large collection of Entity Relationship Diagram examples, samples and templates for data modeling offered at ConceptDraw STORE.

ERD example - Chen diagram

Example 1. ERD Example - Chen Diagram

This sample diagram is one of ER Diagram examples included to Entity-Relationship Diagram (ERD) solution. It shows the type of icons and graphics you can use to develop a model of a database of arbitrary complexity according to Chen's notation.

ERD example - Crows's Foot diagram

Example 2. ERD Example - Crows's Foot diagram

This sample diagram was created using the drawing tools of Entity-Relationship Diagram (ERD) solution and shows the type of icons and graphics you can use to develop a model of a database of arbitrary complexity using Crow's Foot notation.

ERD example - Entity Relationship Model Diagram

Example 3. Entity Relationship Model Diagram - Crows's Foot notation

This sample demonstrates an Entity-relationship model diagram. Highlight the boxes in the ERD diagram with bright colors to make it attractive and easy to remember.

ERD example - Students and Teachers

Example 4. Crows's Foot ERD notation - Students and Teachers

This Entity-Relationship Diagram shows the relationships between the Students and Teachers entities. Drawing all entities of ER-diagram in one color spectrum, highlighting the headers, you will make your diagram look stylish and then successfully use it in different conferences, discussions, publications.

ERD example - WordPress File reference

Example 5. Chen ERD notation - WordPress File reference

This ERD example shows an Entity-Relationship Diagram of a WordPress file reference using Chen’s Notation, which represents the entities as rectangles and attributes as ovals. Creating similar Entity Relationship Diagram examples and diagrams in ConceptDraw PRO will take just minutes.

Chen ERD Template

Example 6. Chen ERD Template

This template from Entity Relationship Diagram (ERD) solution contains special objects and settings for creating entity relationship diagrams based on the Chen ERD notation.

How to Create an ERD Diagram

The ability to describe a database using the Entity-Relationship model is delivered by the Entity-Relationship Diagram (ERD) solution.

Open ConceptDraw STORE, check the ERD solution and click “Install”.
This solution extends ConceptDraw PRO with 2 libraries that contains 45 objects advocated by Chen's and Crow’s Foot notations that can be used when describing a database.

ERD symbols - Chen's notation

Pic. 1. ERD symbols - Chen's notation

ERD symbols - Crow's Foot notation

Pic. 2. ERD symbols - Crow's Foot notation

  • From the ConceptDraw STORE open the Chen's ERD, or the Crow's Foot ERD template from the ERD section.
  • Add objects to the diagram by dragging them from the Chen's ERD, or the Crow's Fot ERD library to the document page.
  • Use Clone tool Clone tool for Mac (Mac),Clone tool for Win(Win) to quickly add copies of the selected object.
  • Select the Smart Connector tool smart connector. To connect elements using this tool, drag the connector from one connect dot to another.
  • Use Line, Fill, Shadow and Text tools to format diagram objects.
Entity Relationship Diagram Examples

Example 6. Entity Relationship Diagram Examples (Mac OS X and Windows)

The 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 model.

The ERD solution provides entity relationship diagram examples, templates and library of vector stencils.

ERD Solution

Example 7. Entity Relationship Diagram solution

Entity Relationship Diagram examples from ERD solution for ConceptDraw PRO can be used as a start point for professional ERD drawing. Entity Relationship Diagram examples can be simply modified to illustrate the logical structure of exact database.

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Entity-Relationship Diagram (ERD) with ConceptDraw PRO

Database structures are usually described by ER-diagrams which represents entities as boxes with lines-connections between them. You can create any entity-relationship diagram (ERD) by means of ConceptDraw PRO using ready-to-use templates and special libraries containing all the needed symbols and shapes. Creating a model for your database from now on can take just a few minutes. ERD (entity relationship diagram) designed to show the logical structure of databases. It intended to depict the relationships between data components (entities). ERDs are a popular tool for software engineers and architects. Using ERD they can manage the every aspect of database design. Also ERD can be used as guidelines for testing and communications before software release. This diagram represents the file reference system of the WordPress web platform. Because entity relationship diagrams have such a broad application area through the prevalence of database technology, it can be applied for a wide range of users.erd diagram example, er-diagram design software
Picture: Entity-Relationship Diagram (ERD) with ConceptDraw PRO
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Entity Relationship Diagram Software

The world-best Entity Relationship Diagram software suitable for professional ERD drawing is ConceptDraw PRO software extended with the Entity-Relationship Diagram (ERD) solution. This solution contains all libraries, templates and samples you may need for professional ERD drawing.Entity Relationship Diagram Software
Picture: Entity Relationship Diagram Software
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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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Entity Relationship Diagram Symbols

When we start to speak about databases, we must always mention database structure visualization. One of the most common ways to do it is to create an entity relationship diagram, and to put appropriate symbols on it. It is important either for database projecting and for its' future maintenance. Entity Relationship Diagram describes data elements and their relationships within a database. There are a set of special symbols that depict each element of an entity relationship diagram. Entities - represents some stable components such as supplier, employee, invoice, client, etc. Relation symbols show how the entities interact. Attributes define characteristics of the relationships. Attributes can be one-to-one or many-to-many. Physical symbols is used in the physical models. They represent items such as fields, tables, types and keys. ERD physical symbols are the building material for the database. Notation lines are used to illustrate the relationships. The most common method is Crow’s Feet notation. You can use ConceptDraw Entity-Relationship Diagram (ERD) solution to represent a database using the Entity-Relationship model.Entity Relationship Diagram Symbols
Picture: Entity Relationship Diagram Symbols
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ERD Symbols and Meanings

A database is a data collection, structured into some conceptual model. Two most common approaches of developing data models are UML diagrams and ER-model diagrams. There are several notations of entity-relationship diagram symbols and their meaning is slightly different. Crow’s Foot notation is quite descriptive and easy to understand, meanwhile, the Chen notation is great for conceptual modeling. An entity relationship diagrams look very simple to a flowcharts. The main difference is the symbols provided by specific ERD notations. There are several models applied in entity-relationship diagrams: conceptual, logical and physical. Creating an entity relationship diagram requires using a specific notation. There are five main components of common ERD notations: Entities, Actions, Attributes, Cardinality and Connections. The two of notations most widely used for creating ERD are Chen notation and Crow foot notation. By the way, the Crow foot notation originates from the Chen notation - it is an adapted version of the Chen notation.Entity Relationship Diagram Symbols and Meaning - crow
Picture: ERD Symbols and Meanings
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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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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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Developing Entity Relationship Diagrams

When you need to visually represent the structure of relational database, Entity relationship diagram (ERD) is a type of diagram for that case. Most entity-relationship diagrams can be built with objects from Flowchart solution or ERD Solution which contains inbuilt templates. Follow these steps to create your own custom ERD diagram. Don't be frightened if it looks complex, ConceptDraw PRO makes it easy to create an ERD, and hundreds of other diagrams, in minutes.Entity Relationship Diagram (ERD), crow
Picture: Developing Entity Relationship Diagrams
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