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This example was designed on the base of Wikimedia Commons file: Example ERD2.png.
"example entity relationship diagram showing relationship between lecturers and students" [commons.wikimedia.org/ wiki/ File:Example_ ERD2.png]
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. [creativecommons.org/ licenses/ by-sa/ 3.0/ deed.en]
"Relationship diagrams (also known as logical data models) are used to design relational databases and can be a good way of understanding the structures in a data set. The 3 building blocks of an Entity Relationship model are entities, attributes and relationships. An entity is a discrete and recognisable 'thing', either a pysical object ..., or concept ... Each entity can be physically represented as a table, where each column of the table is an attribute of the entity ... A relationship is a verb that links two or more entities. ... Importantly, relationships also have a cardinality that can be 'one to one', 'many to one', 'one to many' or 'many to many'. ... Many to many relationships are often a sign that a design needs to be further elaborated. For example the 'teaches' relationship between teachers and students at a university would be many to many and would require the introduction of entities like class and date to fully understand the relationship." [en.wikibooks.org/ wiki/ Data_ Science:_ An_ Introduction/ Thinking_ Like_ a_ Data_ Engineer]
The entity-relationship diagram example "Lecturers-students relationship ERD" was drawn using ConceptDraw PRO software extended with the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park.
Entity-relationship diagram
Entity-relationship diagram, entity,
Used Solutions

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

entity-relationship diagram, ER-diagram, database 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

ConceptDraw DIAGRAM ER Diagram Tool

ConceptDraw DIAGRAM ER Diagram Tool *
Entity-relationship model, also called ER-model, is the main tool of domain modeling on the stage of conceptual design. The modeling of domain data structures is based on the use of graphical tools - Entity-Relationship diagrams (ER-diagrams). The core concepts of ER-Diagram are entity, attribute and relationship. ER-diagram lets visually represent the entities, helps effectively document all properties of designed system and to detail the data storages. To represent the elements at ER-model are commonly used Chen’s notation and Crow’s foot notation, each has its pros and cons. The entity on ER-diagram is represented in the form of rectangle, which specifies its name. An attribute is a property of the entity and relationship is an interaction between the entities. The relationship between two entities is called binary, between more than two entities - ternary. Specific software, such as ConceptDraw DIAGRAM with Entity-Relationship Diagram (ERD) solution from ConceptDraw Solution Park is helpful for easy creation Entity-Relationship Diagrams.

How to Draw ER Diagrams

How to Draw ER Diagrams *
An Entity Relationship (ER) Diagram is a type of flowchart that illustrates the logical structure of databases, how the different entities, such as people, objects or concepts relate to each other within a given system. How to draw ER Diagrams fast and easy? ConceptDraw DIAGRAM diagramming and vector drawing software enhanced with Entity-Relationship Diagram (ERD) solution from Software Development area of ConceptDraw Solution Park offers you the powerful abilities of designing the ER Diagrams and ERD drawings without efforts. This solution includes a lot of predesigned icons advocated by popular Chen's and Crow’s Foot notations, which can be used when describing an enterprise database and depicting it by abstract way. Simply drag the required objects to ConceptDraw document, connect them in a desired way and make style settings. But the easiest and fastest way of drawing ERDs is to make them on the base of ready-to-use Chen ERD and Crow's Foot ERD templates, which are both represented at ConceptDraw STORE.

ducation infographics and infograms, Business intelligence dashboards, Business intelligence charts and maps, Bubble diagrams and charts, Spray diagrams, Circle-Spoke diagrams and models, Circle diagrams, Circular arrows diagrams, Circular flow diagrams, Education Package

ducation infographics and infograms, Business intelligence dashboards, Business intelligence charts and maps, Bubble diagrams and charts, Spray diagrams, Circle-Spoke diagrams and models, Circle diagrams, Circular arrows diagrams, Circular flow diagrams,
Education Package is a comprehensive set of multifarious graphical solutions from ConceptDraw Solution Park, collected together in help to ConceptDraw DIAGRAM users working in a field of science, education and training, which is aimed at improving the quality of education and helping to design with ease variety of interesting and colorful educational materials, diagrams, charts and maps. Use it to present the information and knowledge in an interesting, clear, structured and simple form to achieve a success in education and pedagogy, to maintain the interest of students and pupils throughout the whole learning process, at the lectures, lessons and even during independent work with additional materials, to contribute to better perception of scientific information by listeners during the conferences and reports.

Data Flow Diagram Symbols. DFD Library

Data Flow Diagram Symbols. DFD Library *
Data Flow Diagrams graphically represent the information transfers and process steps of a system. They visually depict how data are processed by a system in terms of inputs and outputs, how occurs the input in a system, how the data flow through an information system and where they are stored, and how occurs output from the system. DFDs give the overview of the system and models the processes aspects, they are maintained with other methods of structured systems analysis. The main goal of DFDs is achievement of understanding between developers and users. For their construction are used two notations - Gane-Sarson and Yourdon, each of them uses its own set of symbols. Data Flow Diagrams solution from Software Development area extends the ConceptDraw DIAGRAM software with templates, samples, and predesigned libraries of data flow diagram symbols for both notations, allowing you easy design the process-oriented and data-oriented models, draw the Data Flow Diagrams, Data Flowcharts, Data Process Diagrams, Information Flow Diagrams, Structured Analysis Diagrams, etc.

seating chart for a classroom, classroom seating chart template, school floor plans, high school floor plans, classroom seating charts, classroom seating chart, classroom seating chart maker, classroom layout? School and Training Plans

seating chart for a classroom, classroom seating chart template, school floor plans, high school floor plans, classroom seating charts, classroom seating chart, classroom seating chart maker, classroom layout?
School and Training Plans solution enhances ConceptDraw DIAGRAM functionality with extensive drawing tools, numerous samples and examples, templates and libraries of classroom design elements for quick and professional drawing the School and Training plans, School Floor plans, Classroom Layout, Classroom Seating chart, Lecture Room plans of any complexity. Each offered classroom seating chart template is a real help for builders, designers, engineers, constructors, as well as teaching personnel and other teaching-related people in drawing Classroom Seating charts and Training Room layouts with ConceptDraw DIAGRAM classroom seating chart maker.

Healthcare, Health, biomedicine, Anatomy, Pharmacy, Medical Health Package

Healthcare, Health, biomedicine, Anatomy, Pharmacy, Medical
Health Package is a set of multifaceted solutions intended for visualization and illustration in a field of medicine and health, for drawing colorful, interesting and precise illustrations and infographics that will be used successfully in medical documents, articles, special magazines, posters, billboards, websites, presentations, collages. Having these solutions available, it will not be difficult to illustrate the medical editions, to convey the information in a full and interesting form, to teach students with use effective visual methods, to describe the medical facts, to tell about innovations in a field of medicine, health and correct nutrition, to explain the causes and consequences of different diseases, as well as the measures of their prevention and treatment.

Applications

Applications *
Use ConceptDraw MINDMAP for creative thinking, planning, organization, problem solving, presentations, decision making, note taking, team brainstorming and other tasks.

medical symbol, medical illustration, doctor symbol, medical specialties, medical diagnosis, medical imaging Medical Illustrations

medical symbol, medical illustration, doctor symbol, medical specialties, medical diagnosis, medical imaging
Medical Illustrations solution including the set of professionally developed examples and samples dedicated to medicine, large variety of ready-to-use vector objects and icons of diagnostic equipment, treatment equipment, medical instruments, tools and devices, medical professionals and health workers of different medical specialties, medical procedures and patients, medical pictograms and medical symbols, among which are the famous red cross symbol, heartbeat symbol, doctor symbol, and many others, is a perfect help in questions of medical illustration and medical imaging, creation professional-looking, colorful and attractive Medical illustrations, Medical diagrams and infographics, slides for presentations in a field of medicine and health care, depicting the medical facts, the information about varied diseases and ways of medical diagnosis, methods of prevention and treatment diseases.