Entity–Relationship modeling was developed by Peter Chen in 1976 for database design. Usually ER Model is constructed as abstract data model which defines information structure and data.
The Entity-Relationship Diagram (ERD) is the world-known way to show the logical structure of databases in visual manner. It gives an overall plan of how the database will look and is constructed of graphical elements, mainly of rectangles (representing entities and their properties) and lines (representing relationships and relationships of entities with each other). All relationships are divided into three categories: one-to-one (1:1), one-to-many (1:N), and many-to-many (M:N). Each entity has properties or characteristics that are implemented in the form of attributes that describe each entity instance.
The best software tool for drawing Entity-Relationship Diagram is ConceptDraw DIAGRAM ector graphics software with Entity-Relationship Diagram (ERD) solution from Software Development area which gives the ability to describe a database using the Entity-Relationship model.
Example 1. Entity-Relationship Diagram (ERD) - Students and Teachers
Entity-Relationship Diagram (ERD) solution includes vector icons advocated by popular Chen's or Crow's foot notations that can be used when describing an enterprise database. All they are offered by the libraries: ERD Chen's Notation and ERD Crow' Foot Notation.
Example 2. ERD Libraries
Develop ER models and ER diagrams using these predesigned vector objects, or start with one of predesigned ERD templates from the Entity-Relationship Diagram solution. Two professionally designed ERD templates (Chen and Crow's Foot) are available at ConceptDraw STORE.
Example 3. ConceptDraw STORE - ERD Templates
The vector graphic diagrams produced using the Entity-Relationship Diagram (ERD) solution and also samples included to it can be successfully used in whitepapers, presentations, datasheets, posters, or any technical materials.
Example 4. Entity-Relationship Diagram
The Entity-Relationship Diagram samples you see on this page were created in ConceptDraw DIAGRAM diagramming and vector drawing software using the Entity-Relationship Diagram (ERD) solution from ConceptDraw Solution Park. An experienced user spent 5 minutes creating each of these diagrams.
Use ConceptDraw DIAGRAM enhanced with Entity-Relationship Diagram (ERD) solution to draw quick and easy your own Entity-Relationship Diagram using Chen's or 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.
NINE RELATED HOW TO's:
A waterfall model describes software development process as a sequence of phases that flow downwards. SSADM is one of the implementations of waterfall method. It’s easier to learn about structured systems analysis and design method (SSADM) with ConceptDraw DIAGRAM because this software has appropriate tools for creating data flow diagrams. You can use all the three main techniques of SSADM method with special tools and predesigned templates.
This data flow diagram illustrates the Structured Systems Analysis and Design Method. This method method considers analysis, projecting and documenting of information systems. Data flow models are the most important elements of SSADM and data flow diagrams are usually used for their description. It includes the analysis and description of a system as well as visualization of possible issues.
Picture: Structured Systems Analysis and Design Method. SSADM with ConceptDraw DIAGRAM
ConceptDraw DIAGRAM extended with Data Flow Diagrams solution is the best diagramming and vector drawing software for quick and easy designing the Data Flow Diagram Example of any complexity.
Picture: Data Flow Diagram Example
ConceptDraw DIAGRAM is a powerful tool for business and technical diagramming.
Software Development area of ConceptDraw Solution Park provides 5 solutions:
Data Flow Diagrams, Entity-Relationship Diagram (ERD), Graphic User Interface, IDEFO Diagrams, Rapid UML.
Picture: Software Diagram Examples and Templates
UML Component for Bank - This sample was created in ConceptDraw DIAGRAM diagramming and vector drawing software using the UML Component Diagram library of the Rapid UML Solution from the Software Development area of ConceptDraw Solution Park
Picture: UML Component for Bank
When studying a business process or system involving the transfer of data, it is common to use a Data Flow Diagram (DFD) to visualize how data are processed. Being initially used exclusively in regards to the flow of data through a computer system, now DFDs are employed as the business modeling tools. They are applied to describe the business events and interactions, or physical systems involving data storage and transfer. ConceptDraw DIAGRAM is a powerful Data Flow Diagram software thanks to the Data Flow Diagrams solution from the Software Development area of ConceptDraw Solution Park.
Picture: Data Flow Diagram Software
The vector stencils libraries: Block Diagrams, Blocks with Perspective, Callouts, Connectors, Raised Blocks from the solution Block Diagrams contain specific block diagram symbols such as arrows, input/output symbols, start/end symbols, processing symbols, conditional symbols, commenting symbols, callouts, connectors, etc. for ConceptDraw DIAGRAM diagramming and vector drawing software. The Block Diagrams solution is contained in a "Diagrams" area of ConceptDraw Solution Park.
Use the libraries from the Block Diagrams solution to draw block diagrams for your business documents, presentations and websites in a few minutes.
Picture: Block Diagram
A Telecommunications network is a network of nodes, links, trunks and telephone switches that are connected, operated by telephone companies and realize telephone, audio, visual and data communications among the users. The telecommunications network can also include Internet, microwave, wireless equipment.
This example was created in ConceptDraw DIAGRAM using the Computer and Networks Area of ConceptDraw Solution Park and shows the Telecommunications network.
Picture: Telecommunication networks. Computer and Network Examples