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 PRO 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 PRO 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 PRO 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 PRO 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 PRO 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 PRO.

Martin ERD Diagram - Sales

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.












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ConceptDraw PRO ER Diagram Tool

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.ER Diagram Tool. Chen ERD
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When thinking about data visualization, one of the first tools that comes to mind is a flowchart design. You can find flowchart symbols, shapes, stencils and icons easily on the Internet, but it might take time to systematize this information. Nevertheless, once you start flowcharting, you’ll love its simplicity and efficiency. This diagram consists from standard flowchart symbols, approved by ANSI (American National Standard Institute) for drawing flowcharts. A flowchart is a diagram that represents a step-by-step algorithm of any process, displaying the process stages as boxes that are connected with arrows. Flowchart design makes it clear and readable. Flowchart designed using ConceptDraw PRO flowchart software allows to make attractive and clear process presentation, it makes interpretation of the business process flow fresh and versatile. Great flowchart design view is a big advantage over the diagram created manually on a paper.Flowchart design. Flowchart symbols, shapes, stencils and icons
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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.Entity Relationship Diagram Symbols
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A database is a data collection, structured into some conceptual model. Two most common approaches of developing data models are UML diagrams and ER-model diagrams. There are several notations of entity-relationship diagram symbols and their meaning is slightly different. Crow’s Foot notation is quite descriptive and easy to understand, meanwhile, the Chen notation is great for conceptual modeling. An entity relationship diagrams look very simple to a flowcharts. The main difference is the symbols provided by specific ERD notations. There are several models applied in entity-relationship diagrams: conceptual, logical and physical. Creating an entity relationship diagram requires using a specific notation. There are five main components of common ERD notations: Entities, Actions, Attributes, Cardinality and Connections. The two of notations most widely used for creating ERD are Chen notation and Crow foot notation. By the way, the Crow foot notation originates from the Chen notation - it is an adapted version of the Chen notation.Entity Relationship Diagram Symbols and Meaning - crow
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