Entity Relationship Diagram - ERD - Software for Design
Crows Foot ER Diagrams
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 DIAGRAM 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.
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 DIAGRAM software in macOS 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 DIAGRAM to create quick and easy your own Entity-Relationship Diagrams using the Crow's Foot and Chen's notations.
Example 3. Entity-Relationship (ERD) Diagram Solution
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 users.
TEN RELATED HOW TO's:
Any information system receives data flows from external sources. In order to visualize them there is a list of data flow diagram symbols that describes how the system components cooperate. If you want to create a data flow diagram, ConceptDraw DIAGRAM Solution Park has DFD Library that contains both Yourdon and Gane-Sarson notations.
This figure shows the content of vector libraries, delivered with ConceptDraw solution for data flow diagram (DFD). There are three libraries composed from about 50 vector objects used to make data flow diagrams.
They include a complete set of objects utilized by Yourdon-Coad and Gane-Sarson notations - two primary notations that are apply for data flow diagramming. Also, one can discover additional "Data flow diagram (DFD)" library that provides a data flow diagram elements for designing level 1 and context-level data flow diagrams.
Picture: Data Flow Diagram Symbols. DFD Library
ConceptDraw DIAGRAM diagramming and vector drawing software extended with Chemistry solution from the Science and Education area is a powerful chemistry drawing software that is ideal for quick and easy designing of various: chemistry drawings, scientific and educational chemistry illustrations, schemes and diagrams of chemical and biological lab set-ups, images with chemical formulas, molecular structures, chemical reaction schemes, schemes of labware,
that can be then successfully used in the field of science and education, on various conferences, and so on.
Picture: Chemistry Drawings
In order to be successful, you have to promote your business on the market. One of the ways for planning this promotion is to create a social media DFD Flowchart which will contain all the details of your business strategy. Social media is a very influential tool, and it's a mistake to ignore it.
The following flowchart represents a best way to estimate social media posts, and gives a strategy of responses. This flowchart is designed in the format of cross-functional flowchart. With this format, we can divide the process into three distinct phases. This approach helps to generate well-considered and balanced response on social networks activities. Using ConceptDraw solution for Social Media Response, your reaction to social media posts will positively mirror the values and mission of your business.
Picture: How to Create a Social Media DFD Flowchart
Biology solution offers 3 libraries of ready-to-use predesigned biology symbols and vector clipart to make your biology drawing and biology illustration making fast and easy: Carbohydrate Metabolism Library, Biochemistry of Metabolism Library, Citric Acid Cycle (TCA Cycle) Library.
Picture: Biology Illustration
The vector stencils library Chen ERD from the solution Entity-Relationship Diagrams (ERD) contains specific symbols of the Chen ERD notation including entity symbols and relationship symbols for ConceptDraw DIAGRAM diagramming and vector drawing software. The Entity-Relationship Diagrams (ERD) solution is contained in the Software Development area of ConceptDraw Solution Park.
Picture: Chen ERD Diagram
An example flowchart of marketing analysis shows main steps you have to challenge writing a marketing analysis.
Picture: Flowchart Example: Flow Chart of Marketing Analysis