ConceptDraw PRO ER Diagram Tool

The main tool of domain modeling at the stage of conceptual design is the Entity-relationship model, also called ER-model. Modeling domain data structures is based on the usage of graphical tools - ER-diagrams (Entity-Relationship diagrams). Simply put, it is a visual representation of relationships between entities.

The core concepts of ER Diagram are entity, attribute and relationship. An entity is an object of the real world that can exist independently. An entity has instances which differ in attribute values and allow unambiguous identification. An attribute is a property of the essence. For example, the entity named Book is characterized by attributes such as author, title, price, publishing house, edition, number of pages. Specific books are instances of the book entity. These instances vary in the values of these attributes and are uniquely identified by the attribute "name". Attribute that uniquely identifies the instance of the entity is called the primary key. It may also be a composite key, which is a combination of several attributes.

A very important feature of the entity-relationship model is that it can be represented as a graphical diagram. This greatly facilitates the subject area analysis. There are several notations used to represent entity-relationship elements, like Crow’s foot notation, or Chen notation, and each has its pros and cons.

ER Diagram Tool. Chen ERD

Example 1. ER Diagram

The entity on the ER-diagram is represented in the form of a rectangle, which indicates its name. Relationship is the interaction between entities, which is characterized by degree which counts how many entities are involved in the relation. The relationship between the two entities is called binary, and the relationship between more than two entities is ternary. Attributes, entities and relationships are connected by straight lines. Relation is shown in the form of a diamond. When creating a diagram, you can follow a few obvious steps. First, you need to identify entities and relationships among them. The following step is to identify the semantic information in the sets of relations (for example, whether a certain set of connections is a 1:n relation). Then you should define relationships cardinalities and determine attributes and their values sets. The final step is to organize the data in the form of entity-relationship connections.

As an example, let’s imagine a database designed for storing information about some bank activities. The bank has affiliates, which are controlled by managers. Customers of the bank have different types of accounts - current, term, demand, deposit, card account. Branches handle these accounts. The described domain will be called Bank. Let’s determine four entities: the Affiliate, the Manager, the Account, the Customer and some relations among them: the Manager controls the Affiliate; the Affiliate handles the Account; the Customer has the Account.

ConceptDraw PRO with Entity-Relationship Diagram (ERD) solution serving as ERD software allows you to visually create Entity Relationship diagrams (ERDs) for various database systems, it supports ODBC-compatible databases (Oracle, MS SQL, InterBase, MySQL, MS Access, Firebird and others). The built-in scripting language allows to connect to ODBC-compatible databases and automatically generate the structure of a database (reverse engineering of the database structure).

ConceptDraw PRO ER Diagram Tool

Example 2. ConceptDraw PRO ER Diagram Tool

ConceptDraw ER Diagram Tool works across any platform, meaning you never have to worry about compatibility again. ConceptDraw PRO allows you to make Entity-Relationship Diagram (ERD) on PC or macOS operating systems.

When creating an ERD our ERD software considers individual database options such as referential integrity, constraints, domains, triggers, stored procedures, functions, packages, views, sequences, synonyms etc.

ConceptDraw PRO is a very easy-to-use and intuitive database design tool and ER Diagram tool which can save you hundreds hours of work. Entity-Relationship Diagram (ERD) solution contains 2 libraries with 45 predesigned vector graphic elements, collection of professional ERD samples, examples and templates.

ConceptDraw PRO is excellent choice of database designers for modeling, reverse and forward engineering of relational databases. It is not only an excellent tool for ER Diagram, but also the one that allows you to reverse engineer already existing database structures, create detailed HTML, PDF or PPT reports.

ER Diagram (ERD)

Example 3. ER Diagram (ERD)

The ER Diagram samples you see on this page were created in ConceptDraw PRO using the Entity-Relationship Diagram (ERD) Solution. They successfully demonstrate solution's capabilities and professional results you can achieve. An experienced user spent 10 minutes creating every of these samples.

Use the Entity-Relationship Diagram (ERD) Solution for ConceptDraw PRO software to create your own professional looking ER Diagrams quick, easy and effective, and then successfully use them in your scientific or education activity.

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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Entity Relationship Diagram Examples

An abstract representation is usually the first thing you will need while developing a database. To understand the ways that databases are structured, you should look through entity-relationship diagram examples and see the notations features and attributes. With an entity-relationship model you can describe a database of any complexity. This Entity-relationship diagram is a tool for software developers. It enables every element of database to be managed, communicated and tested before release. This ERD was created using symbols advocated by Chen's notation. Because of a linguistic origin of the Chen’s notation, the boxes representing entities could be interpreted as nouns, and the relationships between them are in verb form, shown on a diagram as a diamond.Entity Relationship Diagram Examples
Picture: Entity Relationship Diagram Examples
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Entity Relationship Diagram Symbols

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
Picture: Entity Relationship Diagram Symbols
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UML Use Case Diagram Example - Estate Agency

UML Diagram Estate Agency. This sample was created in ConceptDraw PRO diagramming and vector drawing software using the UML Use Case Diagram library of the Rapid UML Solution from the Software Development area of ConceptDraw Solution Park. This sample shows the work of the estate agency and is used by the estate agencies, building companies, at the trainings of the estate agencies, for understanding the working processes of the estate agencies.UML Diagram Estate Agency
Picture: UML Use Case Diagram Example - Estate Agency
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Process Flowchart

When trying to figure out the nature of the problems occurring within a project, there are many ways to develop such understanding. One of the most common ways to document processes for further improvement is to draw a process flowchart, which depicts the activities of the process arranged in sequential order — this is business process management. ConceptDraw PRO is business process mapping software with impressive range of productivity features for business process management and classic project management. This business process management software is helpful for many purposes from different payment processes, or manufacturing processes to chemical processes. Business process mapping flowcharts helps clarify the actual workflow of different people engaged in the same process. This samples were made with ConceptDraw PRO — business process mapping software for flowcharting and used as classic visio alternative because its briefly named "visio for mac" and for windows, this sort of software named the business process management tools. This flowchart diagram shows a process flow of project management. The diagram that is presented here depicts the project life cycle that is basic for the most of project management methods. Breaking a project into phases allows to track it in the proper manner. Through separation on phases, the total workflow of a project is divided into some foreseeable components, thus making it easier to follow the project status. A project life cycle commonly includes: initiation, definition, design, development and implementation phases. Distinguished method to show parallel and interdependent processes, as well as project life cycle relationships. A flowchart diagram is often used as visual guide to project. For instance, it used by marketing project management software for visualizing stages of marketing activities or as project management workflow tools. Created with ConceptDraw PRO — business process mapping software which is flowcharting visio alternative or shortly its visio for mac, this sort of software platform often named the business process management process flowcharts, flowchart symbols, process flow diagram, workflow diagram, flowchart maker
Picture: Process Flowchart
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ERD Symbols and Meanings

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
Picture: ERD Symbols and Meanings
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Basic Flowchart Symbols and Meaning

While creating flowcharts and process flow diagrams, you should use special objects to define different statements, so anyone aware of flowcharts can get your scheme right. There is a short and an extended list of basic flowchart symbols and their meaning. Basic flowchart symbols include terminator objects, rectangles for describing steps of a process, diamonds representing appearing conditions and questions and parallelograms to show incoming data. This diagram gives a general review of the standard symbols that are used when creating flowcharts and process flow diagrams. The practice of using a set of standard flowchart symbols was admitted in order to make flowcharts and other process flow diagrams created by any person properly understandable by other people. The flowchart symbols depict different kinds of actions and phases in a process. The sequence of the actions, and the relationships between them are shown by special lines and arrows. There are a large number of flowchart symbols. Which of them can be used in the particular diagram depends on its type. For instance, some symbols used in data flow diagrams usually are not used in the process flowcharts. Business process system use exactly these flowchart symbols.Flowchart Symbols and Meaning, workflow diagram symbols, process flow diagram symbols
Picture: Basic Flowchart Symbols and Meaning
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Entity Relationship Diagram - ERD - Software for Design Chen ER Diagrams

The Entity-Relationship Diagram (ERD) solution from ConceptDraw Solution Park extends ConceptDraw PRO vector graphics and diagramming software with the ability to describe a database using the Entity-Relationship (Chen) model. Use it for design your ERDs and verify that ConceptDraw PRO offers the best ERD diagrams software tools for design element Chen notation.Entity Relationship Diagram Software, Design Elements - Chen (Windows, Macintosh)
Picture: Entity Relationship Diagram - ERD - Software for Design Chen ER Diagrams
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ER Diagram for Cloud Computing

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
Picture: ER Diagram for Cloud Computing
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Example of DFD for Online Store (Data Flow Diagram)DFD Example

Structured-systems analysis and design method uses data flow diagrams to represent the process of data flowing through a system. Talking about this might be useless without a proper example of DFD for online store (Data Flow Diagram). This DFD example shows all the distinctness that a diagram can bring into a scattered data structure. Data flow diagrams are used to show how data is processed within some business processes. Making DFD is a common practice for business process modeling and analysis. This diagram represents the online store business flow. It describes inputs and outputs within online selling process and depicts the interactions between its participants. This DF diagram can be used by system analysts to create an overview of a business, to study and discover its inherent strengths and weak points.Online Store Data Flow Diagram
Picture: Example of DFD for Online Store (Data Flow Diagram)DFD Example
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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
Picture: ConceptDraw PRO ER Diagram Tool
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