"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.
"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.
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.
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 Mockup for iPhone Application
The Apple iPhone user interface has become something of a standard for smartphones, and mobile devices in general. A well-designed user interface (UI) is very important for user-friendly navigation and the best correlation with operating system logic. Development of successful iPhone App UI requires a planning and prototyping stage. An iPhone UI diagram can be employed to give a general view of the device's screen, upon which elements can be placed and re-arranged as necessary. Using ConceptDraw DIAGRAM you can mock-up an iPhone UI system so that you can figure out how best to represent user interface (UI) elements for the development of a new iPhone App.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.Applications
ConceptDraw DIAGRAM is a multipurpose software from ConceptDraw suite intended for diagramming, business and technical drawing, and visual documenting. You can reach a lot of practical benefits from the use of ConceptDraw DIAGRAM. The list of ConceptDraw DIAGRAM applications and versatile possibilities is extremely great. Among them network and system diagramming, business diagramming, Cisco network design, network visualization, software and database design, software development, business flowcharting, data flow design, databases modeling and visualization, business processes modeling, business drawing, technical drawing, GUI prototyping, Organizational charts construction, business processes fixing, web site planning and design, Internet solutions design, information architecture design, UML modeling, ER diagrams design, home and landscape design, and a lot of other applications. ConceptDraw DIAGRAM offers the users a beneficial collaboration, compatibility with MS Visio and many other popular programs, including other products from ConceptDraw suite.- ERD Symbols and Meanings | Entity Relationship Diagram Symbols ...
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