Entity Relationship Diagram - ERD - Software for Design
Crows Foot ER Diagrams


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ER-model is used in a high-level (conceptual) design databases. You can use it to identify key entities and designate connections that can be established between these entities. During database design the ER model is converted into specific database scheme based on the selected data model (relational, objective, networking, or any other).

Crow's Foot notation was proposed by Gordon Everest, originally called Inverted Arrow. According to this notation, the entity is represented by rectangle containing its name. Name of the entity must be unique within this model. In this case, the name of the entity is a name of type, rather than a specific instance of this type. A concrete representative of the entity is called by the entity instance.

The entity attributes are written inside the rectangle depicting entity. Among the attributes is also highlighted the entity key - the set of attributes the values ​​of which in aggregate are unique for each instance of the entity.

Relation is depicted by line which ties two entities involved in a relationship. The plurality of the relationship is indicated graphically by a "plug" on the end of the link. Optionality of a link is marked by a circle at the end of the link.

Entity-relationship diagrams based on both Chen's and Crow's Foot notations, can be easily drawn using the ConceptDraw PRO ERD diagrams software tools for design element Crow's Foot and Chen from Entity-Relationship Diagram (ERD) solution.

ERD Crow's Foot library from Entity-Relationship Diagram (ERD) solution contains 17 Crow's Foot notation symbols.

Crow's Foot notation symbols

Example 1. Crow's Foot notation symbols

The shapes which include circles, bars, and symbols, indicate various possibilities. A single bar at Crows foot notation indicates one, a double bar indicates one and only one, a circle indicates zero, and a crow's foot indicates many.

Entity Relationship Diagrams (ERD) illustrates the logical structure of databases. The vector graphic diagrams produced when using the ConceptDraw ERD solution can be successfully used in whitepapers, presentations, datasheets, posters, or any technical materials.

Example 2. Entity Relationship Diagram Software
Design Elements — Crow's Foot (Windows, Macintosh).

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 Crow's Foot notation. An experienced user spent 10 minutes creating each of these samples.

Use the Entity-Relationship Diagram (ERD) Solution for ConceptDraw PRO to create quick and easy your own Entity-Relationship Diagrams using the Crow's Foot and Chen's 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 XML, and many other graphic formats) from the ConceptDraw Solution Browser v3. The Entity-Relationship Diagram (ERD) Solution is available for all ConceptDraw PRO v9.5 or later users.












Use Product:

  • Software Development Tool
  • Diagram Software
  • Technical Diagramming Tool
  • Business Diagramming Tool
  • Professional Business Graphics Tool
  • ERD Diagrams Software
  • Cross Platform Compatibility


Use Solution:

Entity-Relationship Diagram (ERD)
  • Describing a database
  • Illustrate the logical structure of databases
  • Chen's notation
  • Crow’s Foot notation
  • Quick-Start ERD templates and samples
  • Entity Relationship Diagram examples
  • ERD vector elements
  • Import/Export Microsoft Visio™
  • Export to graphics files and PDF
  • Export to PPT™
  • Make Presentation


See also samples:



Entity Relationship Diagram Examples:


Entity Relationship Diagram Example - Chen notation

Chen notation

Entity Relationship Diagram Example - Crow's Foot notation

Crow's Foot notation

Entity Relationship Diagram Example - Entity Relationship Model Diagram

Entity Relationship Model Diagram

Entity Relationship Diagram Example - Students and Teachers

Students and Teachers

Entity Relationship Diagram Example - WordPress File reference

WordPress File Reference




Compatibility: Apple® OS X 10.10 or later
Microsoft® Windows® 7/8.1/10

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