E-R Diagrams
Complexity of databases increases day by day, due to this the Entity relationship models and E-R diagrams become more and more popular, and now are an important part of database design. E-R diagrams allow visually and graphically represent structure and design of databases.
You can use so popular Chen's notation to represent all components of database and their relationships on the ER diagram. This notation was developed and implemented by Peter Chen in 1976. The main components of the E-R diagrams are:
- entities,
- attributes that describe these entities,
- relationships among these entities that describe associations between the data,
- cardinalities that describe the number of relationship participants: one-to-many (1:M), many-to-many (M:N), and one-to-one (1:1).
In a Chen's notation, entities are represented by rectangles on the diagram with the entity names written inside and relationships are represented by diamonds. Another popular type of E-R diagrams is known as Crow's Foot notation that is derived from the Chen's notation.
Example 1. E-R Diagram - Students and teachers
Use of ConceptDraw DIAGRAM for professional ERD drawing includes using the predesigned components of ER diagram, such as entity relationship symbols, work flow shapes, entity relationship stencils. All they are provided for easy use by 2 libraries of Entity-Relationship Diagram (ERD) Solution from the Software Development Area for ConceptDraw Solution Park.
Example 2. ERD Libraries
There is also wide collection of predesigned E-R Diagrams which is represented at ConceptDraw STORE. All E-R Diagrams samples and templates are well thought-out, professionally designed, can be easy changed according to your needs and further successfully used.
Example 3. E-R Diagrams in ConceptDraw DIAGRAM
The following features make ConceptDraw DIAGRAM extended with the Entity-Relationship Diagram (ERD) solution the most effective E-R diagrams design software:
- You don't need to be an artist to draw professional looking diagrams in a few minutes.
- Large quantity of ready-to-use vector objects makes drawing your diagrams quick and easy.
- Extensive collection of pre-designed templates and samples give you a great start for your own diagrams.
- ConceptDraw DIAGRAM provides you with the possibility to use the grid, rules and guides. You can easily rotate, group, align, and arrange objects, and use different fonts and colors to make your diagram stand out.
- All ConceptDraw DIAGRAM documents are vector graphic files and are available for reviewing, modifying, and converting to a variety of formats: image, HTML, PDF file, MS PowerPoint Presentation, Adobe Flash, MS Visio.
- Using ConceptDraw STORE you can navigate through ConceptDraw Solution Park, managing downloads and updates. You can access libraries, templates and samples directly from ConceptDraw STORE.
- If you have any questions, our support is free of charge and always ready to come to your aid.
TEN RELATED HOW TO's:
The SDL Diagrams produced with ConceptDraw DIAGRAM are vector graphic documents and are available for reviewing, modifying, and converting to a variety of formats
Picture: SDL Diagram
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Database design is an important part of any project, as databases become more and more complex nowadays. To make the model more representative, entity relationship diagrams are widely used in software engineering area. These diagrams show sets of entities as rectangles connected via lines labeled with their cardinalities.
This an example of the ER-diagram developed to store information regarding some online role-playing game. It includes three main elements of ER diagram: entities, relationships and attributes. The entities, attributes and relationships on this ER-diagram is depicted according to the Chen's notation. Chen's notation for Entity Relationship diagrams admits using of rectangles to depict entities, ovals for attributes and ,at least, diamonds to show relationships. ConceptDraw Entity-Relationship Diagrams solution was applied as ERD software to create this diagram.
Picture: ConceptDraw DIAGRAM ER Diagram Tool
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UML Deployment Diagram depicts the physical deployment of artifacts on nodes (nodes are the existing hardware components, artifacts are the software components running on each node); and how the different pieces are connected.
Use ConceptDraw DIAGRAM with UML deployment diagram templates, samples and stencil library from Rapid UML solution to model the physical deployment of artifacts on nodes of your software system.
Picture: UML Deployment Diagram
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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 DIAGRAM software.
Picture: Martin ERD Diagrams
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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
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Electrical Engineering Solution used together with ConceptDraw DIAGRAM drawing facilities makes short a work of drawing various electrical and electronic circuit schemes. A library of vector objects composed from symbols of Analog and Digital Logic elements of electric circuit includes 40 symbolic images of logic gates, bistable switches of bi-stable electric current, circuit controllers, amplifiers, regulators, generators, etc. All of them can be applied in electronic circuit schemes for showing both analog and digital elements of the circuit.
Electrical Engineering Solution used together with ConceptDraw DIAGRAM drawing facilities makes short a work of drawing various electrical and electronic circuit schemes. A library of vector objects composed from symbols of Analog and Digital Logic elements of electric circuit includes 40 symbolic images of logic gates, bistable switches of bi-stable electric current, circuit controllers, amplifiers, regulators, generators, etc. All of them can be applied in electronic circuit schemes for showing both analog and digital elements of the circuit.
Picture:
Electrical Diagram Symbols F.A.Q.
How to Use Electrical ConceptDraw Diagram Software
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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
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Computer and Networks solution provides examples, templates and vector stencils library with symbols of local area network (LAN) and wireless LAN (WLAN) equipment.
This example of computer network topology diagram shows home WLAN equipment and their connection to the Internet.
Picture: Network Topology Graphical Examples
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Every corporate network is unique, though there are guidelines and best practices in developing networks. As it is quite difficult to implement a pure topology within a company, using a hybrid network topology is considered a better solution. As a rule, such network assembles advantages and features of source topologies.
This diagram is an example of the Hybrid network. This type of network topology means a conjunction of other network topologies. Such as star-bus, ring-mesh topologies, etc. It should be obviously diverse networks. The final computer network inherits both advantages and disadvantages of its ingredients. Using the ConceptDraw Computer and Networks solution including vector graphic libraries and templates one can develop professional custom network diagrams of any topology and complexity.
Picture: Hybrid Network Topology
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Entity Relationship Diagram (ERD) is an acknowledged method to visualize the logical structure of databases. Using special symbols described in ERD notations you can depict a database of any complexity.
The vector graphic ER diagrams produced when using ConceptDraw ERD solution can be used in whitepapers, presentations, datasheets, posters, or any technical materials.
Picture: What is Entity-Relationship Diagram
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ConceptDraw
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