Entity-Relationship Diagram
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:
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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When we start to speak about databases, we must always mention database structure visualization. One of the most common ways to do it is to create an entity relationship diagram, and to put appropriate symbols on it. It is important either for database projecting and for its' future maintenance.
Entity Relationship Diagram describes data elements and their relationships within a database. There are a set of special symbols that depict each element of an entity relationship diagram. Entities - represents some stable components such as supplier, employee, invoice, client, etc. Relation symbols show how the entities interact. Attributes define characteristics of the relationships. Attributes can be one-to-one or many-to-many. Physical symbols is used in the physical models. They represent items such as fields, tables, types and keys. ERD physical symbols are the building material for the database. Notation lines are used to illustrate the relationships. The most common method is Crow’s Feet notation. You can use ConceptDraw Entity-Relationship Diagram (ERD) solution to represent a database using the Entity-Relationship model.
Picture: Entity Relationship Diagram Symbols
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ConceptDraw DIAGRAM compatible Mac OS X software extended with powerful Entity-Relationship Diagram (ERD) Solution from the Software Development Area for ConceptDraw Solution Park is one of the famous ER Diagram Programs for Mac. It gives the perfect ability to draw ER diagrams for visually describing databases with Chen's and Crow's Foot notation icons.
Picture: ER Diagram Programs for Mac
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While designing a conceptual data model, you should use appropriate software. For instance, ConceptDraw DIAGRAM is a user-friendly ER diagram tool that has a lot of samples and templates to facilitate your work. A clear entity-relationship diagram helps to define the relations between system’s components.
Software engineering is the section of a computer science engaged to design, realization, and support of complex software products. An ERD is a data modeling method that is widely applied in the software engineering practice. Commonly it is used for developing a structure of a a relational database. An entity relationship diagram is helpful for structuring and organizing databases that can be modeled using a relational structure. An entity relationship diagram is designed to depicts the interrelationships within the sets of entities which are accumulated in the database. Each entity represents a particular component of a data. Thus, ER diagrams depicts the logical structure of databases. ConceptDraw ER Diagrams solution provides software engineers with the professional tool for making entity-relationship diagrams.
Picture: Entity Relationship Diagram Software Engineering
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When creating ER diagrams, you can apply different color ER diagram styles and also notation styles. ConceptDraw DIAGRAM enhanced with Entity-Relationship Diagram (ERD) Solution gives the ability to draw visual and attractive ER Diagrams using the style icons from Crow’s Foot notation and Chen's notation professionally designed and offered by ERD Chen's Notation and ERD Crow’s Foot Notation libraries.
Picture: ER Diagram Styles
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It is easy to recreate any informational system structure using diagrams. There are three main components of any ER diagram: entity, attribute and relationship. Basing on these three components, one can define other, less used elements, such as weak entity or relationship, derived attribute, recursive relationship etc.
This is the set of graphic elements of ERD Chen's notation. This ERD notation is used to represent an entity–relationship models. It involves the set of geometric forms: rectangles - depicting entities, ovals - representing attributes and diamonds depicting relationships assigned for first-class objects, that can have relationships and attributes of their own. Connections are displayed with arrowed lines. It is known that the Chen's ERD notation is used to show a detailed view of entities and relationships. ConceptDraw Entity-Relationship Diagram solution from the Software Development section of Solution Park provides the ability to create ERD of database structure for software development purposes using the Chen’s notation elements.
Picture: Components of ER Diagram
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Choose which of business design elements you love best.
Design your own style with Business and Finance Solutions from ConceptDraw DIAGRAM.
We created a full set of elements, business samples, templates and libraries with vector clip art for drawing the Business Illustrations.
Mark your report or presentation, pay an attention of audience on your drawings with vector business design elements.
Picture: Business - Design Elements
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Data modeling is actively applied in analysis and uses wide set of methods for description the data requirements in a system. One of the most popular and well-known is the ERD method of database modeling.
The best ERD tool for the Mac and Windows is ConceptDraw DIAGRAM software extended with the Entity-Relationship Diagram (ERD) solution from the Software Development Area for ConceptDraw Solution Park, which is sharpened for professional ERD drawing and data modeling with Entity Relationship Diagram.
Picture: Data Modeling with Entity Relationship Diagram
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Database model is a graphic representation need at the beginning of project development. You won't have any problems with drawing ER diagrams on a Mac anymore with ConceptDraw DIAGRAM application. Special libraries that contain all the symbols of both Chen's and Crow’s foot notation allow you to start database modeling within a few minutes.
Creating entity-relationship diagrams on Mac is fun and effortless when you use a software designed for professional ERD drawing tailored to specific characteristics of Apple OS X. ConceptDraw DIAGRAM is a business diagramming software for those using OS X.
The Entity-Relationship Diagrams solution for ConceptDraw has 2 libraries containing about 50 vector icons, depicting ERD symbols of the most popular Chen's and Crow’s Foot Notations. The other valuable component of the solution is a collection of ERDs samples and templates that can be opened on Macs and PCs.
Picture: Drawing ER diagrams on a Mac
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