"Chen's notation for entity–relationship modeling uses rectangles to represent entity sets, and diamonds to represent relationships appropriate for first-class objects: they can have attributes and relationships of their own. If an entity set participates in a relationship set, they are connected with a line.
Attributes are drawn as ovals and are connected with a line to exactly one entity or relationship set.
Cardinality constraints are expressed as follows:
- a double line indicates a participation constraint, totality or surjectivity: all entities in the entity set must participate in at least one relationship in the relationship set;
- an arrow from entity set to relationship set indicates a key constraint, i.e. injectivity: each entity of the entity set can participate in at most one relationship in the relationship set;
- a thick line indicates both, i.e. bijectivity: each entity in the entity set is involved in exactly one relationship.
- an underlined name of an attribute indicates that it is a key: two different entities or relationships with this attribute always have different values for this attribute.
Attributes are often omitted as they can clutter up a diagram; other diagram techniques often list entity attributes within the rectangles drawn for entity sets." [Entity–relationship model. Wikipedia]
The vector stencils library ERD, Chen's notation contains 13 symbols for drawing entity-relatinship diagrams using the ConceptDraw PRO diagramming and vector drawing software.
The example "Design elements - ER diagram (Chen notation)" is included in the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park.
Attributes are drawn as ovals and are connected with a line to exactly one entity or relationship set.
Cardinality constraints are expressed as follows:
- a double line indicates a participation constraint, totality or surjectivity: all entities in the entity set must participate in at least one relationship in the relationship set;
- an arrow from entity set to relationship set indicates a key constraint, i.e. injectivity: each entity of the entity set can participate in at most one relationship in the relationship set;
- a thick line indicates both, i.e. bijectivity: each entity in the entity set is involved in exactly one relationship.
- an underlined name of an attribute indicates that it is a key: two different entities or relationships with this attribute always have different values for this attribute.
Attributes are often omitted as they can clutter up a diagram; other diagram techniques often list entity attributes within the rectangles drawn for entity sets." [Entity–relationship model. Wikipedia]
The vector stencils library ERD, Chen's notation contains 13 symbols for drawing entity-relatinship diagrams using the ConceptDraw PRO diagramming and vector drawing software.
The example "Design elements - ER diagram (Chen notation)" is included in the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park.
Entity-Relationship Diagram (ERD)
Entity-Relationship Diagram (ERD) solution extends ConceptDraw DIAGRAM software with templates, samples and libraries of vector stencils from drawing the ER-diagrams by Chen's and crow’s foot notations.
"Crow's Foot notation is used in Barker's Notation, SSADM and Information Engineering. Crow's Foot diagrams represent entities as boxes, and relationships as lines between the boxes. Different shapes at the ends of these lines represent the cardinality of the relationship." [Entity–relationship model. Wikipedia]
The vector stencils library ERD, crow's foot notation contains 18 symbols for creating the ER-diagrams using the ConceptDraw PRO diagramming nd vector drawing software.
The example"Design elements - ERD solution (crow's foot notation)" is included in the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park.
The vector stencils library ERD, crow's foot notation contains 18 symbols for creating the ER-diagrams using the ConceptDraw PRO diagramming nd vector drawing software.
The example"Design elements - ERD solution (crow's foot notation)" is included in the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park.
HelpDesk
How to Create an Entity-Relationship Diagram Using ERD Solution
An entity-relationship diagram (ERD)is used in a database modeling process. ERD diagram shows a graphical representation of objects or concepts within an information system and their relationships. The ability to describe a database using the Entity-Relationship model is delivered by the ConceptDraw ERD solution.Software development with ConceptDraw DIAGRAM
Modern software development requires creation of large amount of graphic documentation, these are the diagrams describing the work of applications in various notations and cuts, also GUI design and documentation on project management. ConceptDraw DIAGRAM technical and business graphics application possesses powerful tools for software development and designing technical documentation for object-oriented projects. Solutions included to the Software Development area of ConceptDraw Solution Park provide the specialists with possibility easily and quickly create graphic documentation. They deliver effective help in drawing thanks to the included package of templates, samples, examples, and libraries with numerous ready-to-use vector objects that allow easily design class hierarchies, object hierarchies, visual object-oriented designs, flowcharts, GUI designs, database designs, visualize the data with use of the most popular notations, including the UML and Booch notations, easy manage the development projects, automate projection and development.HelpDesk
How to Design an Interface Mock-up of an Android Application
Uses Interface prototyping is much convenient when you can work through a diagram similar to the device design. ConceptDraw DIAGRAM allows you to develop Android User Interface (UI) prototypes using the special templates and vector libraries of the specific user interface elements. Using ConceptDraw DIAGRAM you can mock-up an Android UI system so that you can figure out how best to represent user interface (UI) elements for the development of a new mobile Apps.HelpDesk
How to Develop Website Wireframes
Website design is a rather complicated process. The development of a website wireframe is an important step in any screen design process. The first step of this process before coding can start, a web designer creates a website wireframe — a mock-up for what will be displayed on the screen when navigating through the web site pages. A wireframe design always includes three components: Information design, navigation design, and interface design. The configuration of these components depends on the business model of the website. The Website Wireframing tools provided with ConceptDraw Website Wireframe solution helps to define the information hierarchy of website design, making it easier for web-developers to plan the layout according to how a site visitor has to process the information.- ERD Symbols and Meanings | Design elements - ER diagram (Chen ...
- Entity Relationship Diagram Symbols and Meaning ERD Symbols ...
- Data Flow Diagram Symbols . DFD Library | Entity Relationship ...
- Components of ER Diagram | Entity Relationship Diagram Symbols ...
- Design elements - ERD (crow's foot notation) | Entity Relationship ...
- Design elements - ER diagram (Chen notation) | Design elements ...
- ERD Symbols and Meanings | Entity Relationship Diagram Symbols ...
- Entity Relationship Diagram Symbols | Design elements - ER ...
- Design elements - ER diagram (Chen notation) | Entity Relationship ...
- Design elements - ER diagram (Chen notation) | Crow's foot ERD ...
- Entity Relationship Diagram Symbols and Meaning ERD Symbols ...
- Entity Relationship Diagram Symbols and Meaning ERD Symbols ...
- Design elements - ER diagram (Chen notation) | Entity Relationship ...
- Entity Relationship Diagram Symbols and Meaning ERD Symbols ...
- Entity Relationship Diagram Symbols and Meaning ERD Symbols ...
- Basic Flowchart Symbols and Meaning | Entity Relationship ...
- Entity Relationship Diagram Symbols | Design elements - ER ...
- Entity Relationship Diagram Software for Design Crows Foot ER ...
- Entity-Relationship Diagram ( ERD ) | ERD Symbols and Meanings ...
- Components of ER Diagram | Process Flowchart | Entity ...