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Entity-Relationship Diagram (ERD)

entity-relationship diagram, ER-diagram, database ERD Entity-Relationship Diagram (ERD)

Entity-Relationship Diagram (ERD) solution extends ConceptDraw PRO software with templates, samples and libraries of vector stencils from drawing the ER-diagrams by Chen's and crow’s foot notations. Read more
entity-relationship diagram, ER-diagram, database ERD

entity-relationship diagram, ER-diagram, database ERD Entity-Relationship Diagram (ERD)

An Entity-Relationship Diagram (ERD) is a visual presentation of entities and relationships. That type of diagrams is often used in the semi-structured or unstructured data in databases and information systems. At first glance ERD is similar to a flowch Read more
entity-relationship diagram, ER-diagram, database ERD
"An ER model is an abstract way of describing a database. In the case of a relational database, which stores data in tables, some of the data in these tables point to data in other tables - for instance, your entry in the database could point to several entries for each of the phone numbers that are yours. The ER model would say that you are an entity, and each phone number is an entity, and the relationship between you and the phone numbers is 'has a phone number'. Diagrams created to design these entities and relationships are called entity–relationship diagrams or ER diagrams.
Using the three schema approach to software engineering, there are three levels of ER models that may be developed. ...
Conceptual data model ... is the highest level ER model in that it contains the least granular detail but establishes the overall scope of what is to be included within the model set.
Logical ER model ... contains more detail than the conceptual ER model. In addition to master data entities, operational and transactional data entities are now defined.
The physical ER model is normally developed to be instantiated as a database. Therefore, each physical ER model must contain enough detail to produce a database and each physical ER model is technology dependent since each database management system is somewhat different.
Physical model ... is normally forward engineered to instantiate the structural metadata into a database management system as relational database objects such as database tables, database indexes such as unique key indexes, and database constraints such as a foreign key constraint or a commonality constraint." [Entity–relationship model. Wikipedia]
This crow's foot entity-relationship diagram (ERD) example "Educational data base" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park. Read more
ERD
ERD, entity,
"In software engineering, an entity–relationship model (ER model) is a data model for describing a database in an abstract way. ...
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]
This ERD example was redesigned using the ConceptDraw PRO diagramming and vector drawing software from the educational data base model. [www2.cs.uregina.ca/~bernatja/crowsfoot.html]
The example "Entity-relationship diagram (Crow's foot notation)" is included in the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park. Read more
Crow's foot ERD
Crow's foot ERD, entity,

Bio Flowchart Lite

This app targets to help teachers and students to create vivid and professional biological flowcharts and diagrams in an easy way. Read more

Bio Flowchart

This app targets to help teachers and students to create vivid and professional biological flowcharts and diagrams in an easy way. Read more
HelpDesk

How to Create an ERD Diagram

ERD (entity relationship diagram) is used to show the logical structure of databases. It represents the interrelationships between components of database (entities). Entity relationship diagrams are a widely used in software engineering. Using ERD software engineers can control the every aspect of database development. ER diagram can be used as guide for testing and communicating before the release of software product. ERD displays data as entities that are connected with connections that show the relationships between entities. There is some ERD notations used by data bases developers for representing the relationships between the data objects. ConceptDraw PRO and its ERD solution allow you to build ERD diagram of any notation. Read more
HelpDesk

How to Create an Entity-Relationship Diagram Using ConceptDraw Solution Park

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. Read more

Diagramme Zeichnen

No need for any special drawing skills to create professional looking diagrams outside of your knowledge base. ConceptDraw PRO takes care of the technical details, allowing you to focus on your job, not the drawing. Read more

How To Draw a Diagram

Is it possible to draw a diagram as quickly as the ideas come to you? The innovative ConceptDraw Arrows10 Technology included in ConceptDraw PRO is a simple and powerful tool to create any type of diagram. You mau choose to start from one of plenty diagram templates or to use your own idea. Read more