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Martin ERD Diagram

The result of any systematic analysis is expected to be an entity–relationship model, defining and describing what exactly is important in the processes of running any business, although it cannot be used for defining the business processes themselves, but only presenting the business data schemas in a way of a graphical form with help of such graphical objects as boxes representing entities being connected with help of lines representing the relationships and so expressing the dependencies as well as the associations between entities. It is interesting to know that any of the possibly existing entity–relationship models can always be represented in any verbal form.

All the entities within the entity–relationship model can be characterized whether by relationships or by the additional properties representing the “attributes”, including the identifiers known to be called as the "primary keys". All the diagrams created for representing the attributes and entities as well as the relationships can always be called the “entity-attribute-relationship diagrams” and they can always be created in ConceptDraw DIAGRAM software as it is one of the best tools existing for making such drawings.

The implementation of any entity–relationship model is a “database”. Each of the rows of a table in a such relational database implementation can represent only one instance of an entity type. At the same time each of the fields in a table can represent any needed attribute type. In a so called “relational database” a relationship between all the mentioned entities can be implemented in a way of storing the primary key of one entity as well as the so called "foreign key" in the table of different entity.

Usually the data models, such as the entity–relationship ones, are built at two-three levels of abstraction. One of the types of the data models existing and widely used is conceptual one. Being the highest level entity–relationship model, it contains the least granular detail. At the same time, it establishes all the scope of what has to be included in the existing model set. Such models usually define the so called “master reference data entities”. These master reference data entities are very widely and commonly used by different organizations working in so many different fields of the business activity. It is always very useful supporting documenting the data architecture for an organization by developing the conceptual entity–relationship models and so such models are used as the foundations for the logical data models which contain more detail to compare to the conceptual entity–relationship model.

There’s another type of the entity–relationship models which is a “physical ER” one. Such models can be developed from any logical entity–relationship model, being developed for a reason of being instantiated as a “database”. It is well-known that each of the physical entity–relationship models must contain enough details for producing a database. Also, every physical entity–relationship model is always technology dependent when every existing database management system is usually known to be very different from each other. The described physical models are usually instantiated to be created in the structural metadata of some database management system. They are normally created as the relational database objects. Such objects can be database indexes (for example, unique key indexes), database constraints (e.g., a commonality constraint or a foreign key constraint) or database tables.

Any entity–relationship model is usually used for designing different modifications for the relational database objects. It also can be used for maintaining the structural metadata of the needed database. At the same time, the data modelling technique can be used for describing any needed ontology for some particular area of interest. Thus, in case of designing some information system based on a database, the “conceptual data model” can be mapped to a “logical” one (for example the “relational model”). Sometimes both of the phases can be referred to as the so called "physical design."

Once you decide to create any needed Entity-Relationship Diagram with help of a professional and well developed software, then one of the best applications will be the ConceptDraw DIAGRAM diagramming and drawing one. Having this tool means enabling yourself to create the great looking diagrams from a scratch using the basic graphical objects from the stencil libraries in the available to all the ConceptDraw DIAGRAM users which can be found within the application itself. To make it even simpler, you can always make your drawing much quicker if you download another product of CS Odessa known to be ConceptDraw STORE application. This new product enables everyone who uses ConceptDraw DIAGRAM to make the needed drawing much faster as ConceptDraw STORE provides lots of pre-made “solutions”, including the “Entity-Relationship Diagrams (ERD)” one full of the stencil libraries with design elements for making only smart looking diagrams and many other schematics.

Entity-Relationship Diagrams (ERD) solution

Example 1. Entity-Relationship Diagrams (ERD) Solution

Most of the mentioned solutions also include the examples and templates, which were previously created by the developers of the ConceptDraw DIAGRAM and ConceptDraw STORE. Those, who know all about how to make a proper diagram, chart, flowchart, map, plan and many other schemes, developed the professional software and so the application which can be used while working in ConceptDraw DIAGRAM

Martin ERD Diagram *

Example 2. Martin ERD Diagram — Sales

The example below illustrates a data model diagram for a store.

Downloading the ConceptDraw STORE application from this site will enable you to get the Entity-Relationship Diagrams (ERD) solution with two stencil libraries where all 45 stencils can be found and so used from. One of the libraries in called “Design Elements — Chen ERD” and another one as “Design Elements — Crow’s Foot ERD”. Having both stencil libraries, which were mentioned, as well as the pre-made templates of the ER diagrams will help you to ensure yourself in making a great looking ERD within only an hour or even less, depending on how familiar you are with the mentioned products of CS Odessa.












NINE RELATED HOW TO's:

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The entity–relationship (ER) model is a data model that lets graphically represent the information system and depict the relationships between people, objects, concepts, places, and events within a given system. It is also convenient to use the ER Diagram for Cloud computing representation and description the Cloud computing architecture, design them with pleasure using the extensive tools of the Cloud Computing Diagrams solution from the Computers and Network area of ConceptDraw Solution Park.ER Diagram for Cloud Computing *
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The first thing that usually comes to mind when talking about database models is ER-diagrams, and the ways to create them. The second most recognizable notation is the Crow’s Foot, which visually differs from Chen’s notation. Actually, it doesn’t matter which notation you’ll use for your entity relationship diagram (ERD), but the content is what matters. When designing an Entity-Relationship Diagram one need to use a certain notated symbols that were developed and standardized especially for databases description. First of them - the Chen’s notation had a linguistic origin. It includes rectangle boxes to show entities that may be described as nouns, and the relationships between them described as verbs depicted in a form of diamond. Finally the Chen’s notation was simplified up to the Crow’s Foot notation. It represents a relationship as labeled line. It is precisely this notation is shown in the given figure. ConceptDraw DIAGRAM together with its Entity-Relationship Diagram (ERD) solution is designed to support professionals who deals with creating ER diagrams using the element of both - Chen’s and Crow's Foot notations.Design Element: Crows Foot   <br>for Entity Relationship Diagram - ERD *
Picture: Design Element: Crows Foot for Entity Relationship Diagram - ERD
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