Entity-Relationship Diagram (ERD)
with ConceptDraw PRO

Entity-Relationship Diagram (ERD) serves for detailed description of structures and databases. An ERD represents a diagram made up mainly of rectangular blocks (for entities, or data) linked with relationships. The links between the blocks describe relations between these entities. There are three types of relationships:

  • one-to-one,
  • one-to-many,
  • many-to-many.

For example, "driver drives a car". Here, the entity "driver" relates to the entity "car" by means of a one-to-one relationship "drives". One driver drives one car.

ER Diagram: one-to-one

An example of a one-to-many relationship is a sergeant commanding a team of soldiers. Here the entity "sergeant" relates to a number of entities "soldier" by means of a one-to-many relationship.

ER Diagram: one-to-many

Since the many-to-many relationship does not adequately represent the nature of interaction between entities, it is rarely used in diagrams, or is used in diagrams with little detail.

Entities and relationships can both have attributes. Example: a car from the first example has number; the "drives" relation may have quality attributes describing the quality of driving, or time attributes, saying when exactly the driver was driving the car.

ER Diagram: attributes

ERDs are mainly used to describe database structures, though they might be used as diagrams describing a structure of a company, organization, or some business processes.

ConceptDraw PRO extended with Entity-Relationship Diagram (ERD) solution from the Software Development Area allows you to draw very complex and detailed ERD. It has a number of libraries with objects used in diagrams, which are included in relevant templates and samples available from ConceptDraw STORE.

Entity-Relationship Diagram (ERD) Solution in ConceptDraw STORE

Example 1. Entity-Relationship Diagram (ERD) Solution in ConceptDraw STORE

In actual practice, ERDs employing the method of P.P. Chen are used most. Choose the Chen ERD template in ConceptDraw STORE. A new document will open along with the library with objects necessary to create a diagram. Drag the vector objects representing entities and relationships, and then just connect them between each other in the required order. Use respective library objects to indicate the types of relationships and their attributes.

erd diagram example, er-diagram design software

Example 2. ERD WordPressFile Reference. Chen's Notation

One of advantages of ERD diagram drawn in ConceptDraw PRO is that when you move entities on the diagram, they stay connected and you don't need to move relationships too.

Apart from building a diagram manually, ConceptDraw has a built-in tool for drawing an ERD automatically, from a database.

Entity Relationship Model Diagram. Crow's Foot Notation

Example 3. Entity Relationship Model Diagram. Crow's Foot Notation

The samples you see on this page were created in ConceptDraw PRO using the Entity-Relationship Diagram (ERD) Solution and demonstrate some of solution's capabilities and the results you can achieve.

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 PRO v9.5 or later users.

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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.Components of ER Diagram
Picture: Components of ER Diagram
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